Full list of all 10 FORM (Windows) achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Windows.
Meet the Unknown
Strike the power chord
Escape the ball pit
Complete first memory
Read All Thought Bubbles
Scanning 10 objects
Pull the blast door lever 10 times
Finish the Lab
Visit all 4 cortex rooms
Find the giraffe