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