Full list of all 25 Quantum Conundrum achievements worth 600 gamerscore. It takes around 15-20 hours to unlock all of the achievements in the base game.
The base game contains 15 achievements worth 400 Gamerscore, and there are 2 DLC packs containing 10 achievements worth 200 Gamerscore.
Powered up the first generator
Break 20 panes of glass
Collect 1st collectible
Pick up the IDS device
Collect all collectibles
Achieve Goal Time on all maps
Achieve Shift Goal on all maps
Use the menu item "Do a thing!"
Power up the second generator
Power up the third generator
Power up the Uber-IDS
Knock Ike over with an object
View your portrait in all dimensions
Make it through every level at least once without dying
Solve "Choose Wisely" choosing each battery first
Complete all levels in "The Desmond Debacle"
Collect all collectibles in "The Desmond Debacle"
Achieve Shift Goal on all levels in "The Desmond Debacle"
Achieve Goal Time on all levels in "The Desmond Debacle"
Complete all levels in "The Desmond Debacle" once without dying.
Complete all levels in "IKE-aramba!"
Collect all collectibles in "IKE-aramba!"
Achieve Shift Goal on all levels in "IKE-aramba!"
Achieve Goal Time on all levels in "IKE-aramba!"
Complete all levels in "IKE-aramba!" once without dying