Complete The Stanley Parable.

Choo Choo!

Put on a show and die trying.

They had no way out.

Make it through the NOVA 6 gas without dying on Rebirth Island.

Escape the Past.

Incinerate 10 enemies with the flamethrower attachment in the POW compound.

A level you published was played by 5 or more people

Build and save a level with more than one player with the thermometer more than 30% full

Fully upgrade all tools

Unlock all skills

Pay mercenaries 5 times