Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Find all secrets.
Beat all Challenges.
Get RED ending in every level of SPEEDRUNrt challenge.
Get RED ending in every level of SPEEDRUN challenge.
Kill over 1987 Red Dudes in endless mode.
Become part of the community.
Upload a replay on killstagram.com
Launch every app in the system.
Unlock all endless levels.
Cut bullet with a katana.
Kill 100 Red Dudes with a rifle.
Kill 3 Red Dudes with one shotgun shot.
Kill 100 Red Dudes with a katana.
Kill 2 Red Dudes with one katana throw.
Complete the game.
Kill 100 Red Dudes with a shotgun.
Score 100 headshots.
Get back to the system after being expelled.
Kill 100 Red Dudes with a pistol.
Kill 100 Red Dudes using melee.
Complete SERV level.
Kill 3 Red Dudes with one rifle burst.
Kill an enemy by jumping on him.
Complete SUBWAY level.
Shoot down a bullet with a bullet.