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