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