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