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