SUPERHOT has a total of 27 collectibles in the form of hidden terminals on various levels of the campaign. The best way to grab them is to complete the campaign and then revisit levels using level select from the main menu. After grabbing a hidden terminal, you can skip the chat screen, and press
start to go to the main menu. You will see
*CRACKED* next to the levels where you have revealed the secret; which just means you have the collectible for that level.
Upon finding the last terminal, you will get a special chat screen and will unlock the achievement upon returning to the main menu.
You can see a video of all the collectible below, with timestamps for individual levels beneath:
[
00:21] - 01KICK.lvl
[
01:19] - 02ALLEY.lvl
[
02:08] - 03CORRID.lvl
[
03:08] - 04DROP.lvl
[
04:02] - 05SUBWAY.lvl
[
04:51] - 06JUMP.lvl
[
05:36] - 07SHOTS.lvl
[
06:19] - 09FIGHTC.lvl
[
07:19] - 10DESPER.lvl
[
07:59] - 11BREAK.lvl
[
08:28] - 13TIRALL.lvl
[
09:51] - 14SERV.lvl
[
10:19] - 15HOSPIT.lvl
[
10:50] - 16DONUT.lvl
[
11:27] - 19OLDBOY.lvl
[
12:13] - 17ELEVAT.lvl
[
12:56] - 20BALLRO.lvl
[
13:30] - 21MEETING.lvl
[
13:54] - 25FALL.lvl
[
14:22] - 26STAIR.lvl
[
15:27] - 27OFFICE.lvl
[
16:24] - 28STATION.lvl
[
18:11] - 29TRAIN.lvl
[
19:02] - 30GATE.lvl
[
19:57] - 31LOBBY.lvl
[
20:39] - 32LONGWAY.lvl
[
21:15] - 32CORE.lvl