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