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