Unlockables
     Complete each achievement to get the allotted gamerscore.

Unlockable:                   How to Unlock:

815 (20)                      Discover all the memories in Flashback 1

Behind the glass (20)         Discover all the memories in Flashback 3

Sweet memory (20)             Discover all the memories in Flashback 2

Crash survivor (25)           Complete Episode 1

Locate the cockpit (25)       Complete Episode 2

Identity crisis (30)          Discover all the memories in Flashback 4

Persephone (30)               Discover all the memories in Flashback 5

Whatever it takes (30)        Discover all the memories in Flashback 6

Via Domus (50)                Complete Episode 3

Into the hatch (75)           Complete Episode 4

Behind the wall (100)         Complete Episode 5

Through the Flame (125)       Complete Episode 6

The way home (200)            Finish the game

A Turn of the Screw (10)      Photograph A Turn of the Screw

Boom boom (10)                Open the secret door

Castaways' Treasures (10)     Photograph: 1- Kate's plane 
                              2- Charlie's guitar 
                              3- Locke's wheelchair

Desmond's Past (10)           Photograph: Kelvin's jump suit Medical 
                              cabinet with vaccines Desmond's mural
                              
Mapping the Island (10)       Photograph: 1- Blast door map 
                              2- Blast door map for the hidden entrance 
                              3- Sayid's cable map

Showdown (10)                 Successfully confront Beady Eyes

4 8 15 16 23 42 (15)          Photograph numbers on sealed hatch

Blackmailer (15)              Convince Locke to help

Button pusher (15)            Enter the numbers

Dharma Ride (15)              Photograph Dharma van

Radzinsky (15)                Photograph bloodstain 
                              on the Swan ceiling

Save the castaways (15)       Prevent the fuel leak from igniting

Slave (15)                    Photograph skeleton in Black Rock

Beam of light (20)            Photograph beam of light coming 
                              from the hatch

Pearl Station (20)            Photograph Pearl Station emblem

Medical Station (20)          Photograph Medical Station emblem

Hero's hero (25)              Save Jack