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.
Get RED ending in every level of SPEEDRUN challenge.
Get RED ending in every level of SPEEDRUNrt challenge.
Unlock all endless levels.
Kill over 1987 Red Dudes in endless mode.
Launch every app in the system.
Kill 3 Red Dudes with one shotgun shot.
Kill 3 Red Dudes with one rifle burst.
Kill 100 Red Dudes with a rifle.
Upload a replay on killstagram.com
Kill 100 Red Dudes with a katana.
Kill 2 Red Dudes with one katana throw.
Cut bullet with a katana.
Complete the game.
Kill 100 Red Dudes with a shotgun.
Score 100 headshots.
Kill 100 Red Dudes using melee.
Get back to the system after being expelled.
Become part of the community.
Kill an enemy by jumping on him.
Kill 100 Red Dudes with a pistol.
Complete SERV level.
Complete SUBWAY level.
Shoot down a bullet with a bullet.
Beat all Challenges.