From SCP: Secret Laboratory English Official Wiki

There are a total of 27 hidden achievements in SCP:SL. These achievements are listed as the following:

CHAAOOOOS! Respawn as Chaos Insurgency.
Crisis Averted Use SCP-500 when you're about to die.
Deep Fried Die from a Tesla Gate burst.
Escape Artist Escape the facility in 3 minutes or under.
For Science! Escape as a Scientist.
Friendship As a Scientist, successfully upgrade your keycard alongside any amount of Class-D.
Gear Up, Boys! Respawn as Nine-Tailed Fox.
Gravity Works Here! Die from a fall.
Ha! I didn't even feel that! Use adrenaline to survive a hit that would otherwise kill you.
Halloween! Play the Halloween version of the game.
High on the Wings of Caffeine Escape while under the effects of SCP-207.
If you want something done right... Kill an SCP as a Scientist.
I'll Pass, Thanks As an SCP, kill someone who's charging or firing the Micro HID.
Involuntary Rage-Quit Die while entering a rage as SCP-096.
Is This Thing On? Broadcast a 'helpful' message via the Intercom.
Is this your first time? Let SCP-173 snap your neck.
It's Always Left, Brothers! Escape as D-Class personnel.
Larry Is Your Friend! Successfully escape from the Pocket Dimension.
Look! I'm a Rocket! Kill yourself with a grenade.
Merry Christmas! Play the Christmas version of the game.
My Cure Is Most Effective... Cure 10 people in a single game.
Microwave Meal Kill an SCP with the Micro HID.
NANI?! As Class-D, kill a Scientist holding a keycard.
Newb Die inside the pocket dimension.
Overcurrent Try to recharge the MicroHID.
Overpowered! Pick up an O5-Keycard.
Pew Pew! Kill 5 enemies in less than 30 seconds.
Property of the Chaos Insurgency Liberate two or more SCP objects from the facility while escaping as a Class-D.
Secure. Contain. Protect. Successfully re-contain SCP-106
T-minus 90 seconds... Survive a successful Alpha Warhead Detonation.
That was... close. Cancel the Alpha Warhead detonation within the last 15 seconds of the countdown.
The Tables Have Turned Disarm a MTF operative
They Are Just Resources... Kill 50 D-Class as a Scientist.
Wow, really? Die within the first minute of the game.
... You Thinking What I'm Thinking? Find any gun as a Class-D.

Removed Achievement

Roasted Take some damage from a Tesla Gate as an SCP and do not die.
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