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