Complete each achievement to get the allotted gamerscore.

10 scored (50)                As the Lead Profile in a single player 
                              game get 10 or more goals in one match 
                              on Professional.
                              
10 up (10)                    As the Lead Profile in a single player 
                              game win 10 Xbox LIVE ranked matches.
                              
5 game streak (10)            As the Lead Profile in a single player 
                              game have a 5 game winning streak 
                              on Professional.
                              
50 game streak (40)           As the Lead Profile in a single player 
                              game win 50 games on Professional.
                              
Blank sheet (30)              As the Lead Profile in a single player 
                              game keep a clean sheet on World Class 
                              difficulty.
                              
Boot Cleaner (15)             As the Lead Profile Complete Challenge 
                              Mode Region 1.
                              
Captain (30)                  As the Lead Profile Complete Challenge 
                              Mode Region 8.
                              
Defensive Hero (10)           As the Lead Profile in a single player 
                              game win Man of the Match as a Defender 
                              on World Class.
                              
Dutch League (10)             As the Lead Profile in a single player 
                              game win the Dutch Eredivisie 
                              in Manager Mode.
                              
English League (10)           As the Lead Profile in a single player 
                              game win the Barclays Premier League 
                              in Manager Mode.
                              
First Team Debut (20)         As the Lead Profile Complete Challenge 
                              Mode Region 5.
                              
First Team Regular (25)       As the Lead Profile Complete Challenge 
                              Mode Region 6.
                              
Football Legend (55)          As the Lead Profile Complete Challenge 
                              Mode Region 10.
                              
French League (10)            As the Lead Profile in a single player 
                              game win League 1 Orange 
                              in Manager Mode.
                              
Genesis (10)                  As the Lead Profile, Create a Player.

German League (10)            As the Lead Profile in a single player 
                              game win the Bundesliga in Manager Mode.
                              
Getting Serious (20)          As the Lead Profile in a single player 
                              game win 50 Xbox LIVE ranked matches.
                              
Grass Roots (5)               As the Lead Profile in a single player 
                              game win an Amateur game vs. the CPU.
                              
Host (10)                     As the Lead Profile in a single player 
                              game host 10 Xbox LIVE Matches.
                              
Italian League (10)           As the Lead Profile in a single player 
                              game win Serie A in Manager Mode.
                              
Man of the Match (25)         As the Lead Profile Complete Challenge 
                              Mode Region 7.
                              
Midfield Maestro (10)         As the Lead Profile in a single player 
                              game win Man of the Match 
                              as a Midfielder on World Class.
                              
Online First (10)             As the Lead Profile in a single player 
                              game win an Xbox LIVE ranked Match.
                              
Part Time Player (10)         As the Lead Profile in a single player 
                              game win a Semi-Professional 
                              game vs. the CPU.
                              
Poacher (10)                  As the Lead Profile in a single player 
                              game win Man of the Match as a Forward 
                              on World Class.
                              
Professional Footballer (20)  As the Lead Profile in a single player 
                              game win a Professional game 
                              vs. the CPU.
                              
Real World (10)               As the Lead Profile, Play an Online 
                              Interactive Leagues game to completion.
                              
Reserve (15)                  As the Lead Profile Complete Challenge 
                              Mode Region 3.
                              
Single Player Hero (10)       As the Lead Profile in a single player 
                              game achieve a 90 player rating 
                              in Be a Pro.
                              
Spanish League (10)           As the Lead Profile in a single player 
                              game win the Spanish Primera 
                              in Manager Mode.
                              
Substitute (20)               As the Lead Profile Complete Challenge 
                              Mode Region 4.
                              
The Legend (45)               As the Lead Profile in a single player 
                              game win a Legendary game vs. the CPU.
                              
This is too much (40)         As the Lead Profile in a single player 
                              game host 50 Xbox LIVE Matches.
                              
Tournament Creation (20)      As the Lead Profile in a single player 
                              game create a tournament.
                              
US League (10)                As the Lead Profile in a single player 
                              game win the MLS in Manager Mode.
                              
Veteran (30)                  As the Lead Profile Complete Challenge 
                              Mode Region 9.
                              
World Class Finisher (30)     As the Lead Profile in a single player 
                              game score more than 5 goals 
                              on World Class.
                              
World Class Player (30)       As the Lead Profile in a single player 
                              game win a World Class game vs. the CPU.
                              
Worldwide Legend (60)         As the Lead Profile in a single player 
                              game win 100 Xbox LIVE ranked matches.
                              
Youth Teamer (15)             As the Lead Profile Complete Challenge 
                              Mode Region 2.


Secret Achievements
     These  are the 9 secret achievements just do what the description
says to unlock them:

Unlockable:                   How to unlock:
Beat yourself (0)             As the Lead Profile in a single player 
                              game score two own goals in a single game

Competition Winner (20)       As the Lead Profile Win a Created 
                              tournament

Extra bonus (20)              As the Lead Profile in a single player 
                              game win by 2 goals in Extra Time 
                              on World Class

Lightning Finisher (10)       As the Lead Profile in a single player 
                              game score a goal in under 5 minutes

Manager Merry-go-round (10)   As the Lead Profile, Play 15 years for 
                              15 different clubs in 15 different 
                              countries

Scruffysocks scores (20)      As the Lead Profile in a single player 
                              game score a Hat Trick with a created 
                              Player

They drew a blank (20)        As the Lead Profile in a single player 
                              game keep a clean sheet in an Xbox LIVE 
                              ranked match

Tour Bus (20)                 As the Lead Profile Play in every Stadium 
                              in the game

World Wide Hat Trick (20)     As the Lead Profile in a single player 
                              game score a Hat Trick in a ranked 
                              Xbox LIVE match