Collected the first Treasure

Lit every Furnace

Collected every Treasure

Picked up the Diving Suit

Picked up the Wrench

Got the second Plunger

Got the third Plunger

Got the fourth (and final) Plunger

Reached the surface by going back to the start

Reached the surface through the adjacent manhole

Lit 30 different Torches

Collected every Map