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