Here is the full list of all 10 The Experiment: Escape Room achievements worth 1,000 gamerscore.
Escape the office in singleplayer
Escape the office while being out of time
Solve all the puzzles
Escape the office with 3 or more people in the party
Escape the office with exactly 2 people in the party
Escape the office in less than half the time
Escape the office in time
Never Assume, there is a reason for everything
Escape the office without taking any hints
Escape the office in multiplayer alone