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