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