Here is the full list of all 12 LIMBO achievements worth 200 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Complete the game in one sitting with five or less deaths
Persistence has its own reward
Don't let gravity keep you down
Vertical passageway
The crate is key
Ride the crates
Don't pull the lever just because you can
Beneath the arthropod
Involves heavy lifting
Prepare a dry landing
Exploration off the ground
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