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