Here is the full list of all 35 SCP: Secret Laboratory achievements.
Find any gun as a Class-D.
Respawn as Chaos Insurgency.
Cure 10 people in a single game.
Die while entering a rage as SCP-096.
Die inside the pocket dimension.
Let SCP-173 snap your neck.
Respawn as Nine-Tailed Fox.
Escape as D-Class personnel.
As Class-D, kill a Scientist holding a keycard.
Die from a Tesla Gate burst.
As a Scientist, successfully upgrade your keycard alongside any amount of Class-D.
Escape as a Scientist.
Broadcast a 'helpful' message via the Intercom.
Kill yourself with a grenade.
Successfully escape from the Pocket Dimension.
Kill 5 enemies in less than 30 seconds.
Pick up an O5-Keycard.
Successfully re-contain SCP-106
Survive a successful Alpha Warhead Detonation.
Disarm a MTF operative
Kill 50 D-Class as a Scientist.
Cancel the Alpha Warhead detonation within the last 15 seconds of the countdown.
Kill an SCP as a Scientist.
Die from a fall.
Die within the first minute of the game.
Kill an SCP with the Micro HID.
Play the Halloween version of the game.
Play the Christmas version of the game.
Escape the facility in 3 minutes or under.
Escape while under the effects of SCP-207.
Use SCP-500 when you're about to die.
Use adrenaline to survive a hit that would otherwise kill you.
As an SCP, kill someone who's charging or firing the MicroHID.
Try to recharge the MicroHID.
Liberate two or more SCP objects from the facility while escaping as a Class-D.