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