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