Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Find all secrets.
Beat all Challenges.
Get RED ending in every level of SPEEDRUNrt challenge.
Get RED ending in every level of SPEEDRUN challenge.
Kill over 1987 Red Dudes in endless mode.
Become part of the community.
Launch every app in the system.
Unlock all endless levels.
Kill 3 Red Dudes with one rifle burst.
Cut bullet with a katana.
Upload a replay on killstagram.com
Kill 2 Red Dudes with one katana throw.
Kill 100 Red Dudes with a rifle.
Kill 100 Red Dudes with a katana.
Kill 100 Red Dudes with a shotgun.
Kill 100 Red Dudes using melee.
Complete the game.
Get back to the system after being expelled.
Kill an enemy by jumping on him.
Score 100 headshots.
Kill 100 Red Dudes with a pistol.
Complete SERV level.
Kill 3 Red Dudes with one shotgun shot.
Shoot down a bullet with a bullet.
Complete SUBWAY level.