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