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