Here is the full list of all 32 In Sound Mind achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Collect all pills in your building
Find all pills in the game
Collect all pills in the forest level
Find and listen to all of Lucas' session fragments
Stun The Flash using your Radio Device
Collect all pills in the factory level
Ride The Bull for 5 seconds
Collect all pills in the lighthouse level
Shoot down a Shade projectile
Shoot a crow
Collect all pills in the supermarket level
Scare The Watcher away using the Mirror Shard
Give a mannequin a face
Acquire the Pistol in your building
Finish In Sound Mind
Collect all vinyl records
Finish Tape 5
Give Dave a high five while fighting for your mind
Finish Tape 4
Find Rosemary's secret song
Find all weapons in the game
Finish Tape 3
Trick The Bull into attacking an inkblot
Access top secret Mayer lab
Hang up on your sneaky stalker
Acquire the Shotgun in your building
Finish Tape 2
Damage The Shade using a weapon
Acquire the Gas Mask in your building
Pet Tonia
Push a cart into the water on the way to Homa Mart
Finish Tape 1