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