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