Encountered the Zombie Plague.

Encountered the Bad Composition.

Encountered the Possessive Mask.

Found the cure.

Recontained SCP-055.

Encountered the Old AI.

Encountered Shy Guy.

Encountered the Old Man.

Acquired the "Telekill Alloy".

Encountered the Shadow Lamps.

Obtained a liquid from the Coffee Machine.

Encountered the Peripheral Jumper.

Acquired a SCP-427.

Swallowed a sample of Panacea.

Encountered an Old Cowbell.

Found a Jaded Ring.

Found a blue key.

Encountered an Old Coffin.

Encountered the Clockworks Machine.

Encountered the Creatures with Many Voices.

Encountered the Sleep Killers.

Encountered a Recursive Room.

Read the Encyclopedia of Common Diseases.

Encountered the Builder Bear.

Encountered the Atrocity Skull.

Encountered the Hole In The Wall.

Wore a GP-5 Gas Mask.

Didn't use console commands.

Beat the game on Keter difficulty.

Acquired an Omni-level keycard.

Escaped the Old Man's Pocket Dimension.

Acquired the S-NAV Navigator Ultimate.

Lured the Old Man through a Tesla Gate.

Found a room contaminated with red ice.

Encountered the Eric's toy.

Found the Infinite Canteen.

Wore a pair of stereoscopic specs.

Get into the sticky situation.

Found an instance of SCP-207.

Found the Old Glasses.

Found the Plasticine Ball.

Found the Obsidian Absorber.

Got close to the Contagious Crystal.

Found SCP-447 and refined it in SCP-914.

Encountered SCP-457.

Encountered the Black Statue.

Donate your blood for the sake of salvation.

Found some Bubble Gum.

Encountered Mobile Task Force.

Unlock the Apollyon difficulty.