Easy "Funny Man" achievement...
	Easy "The Perfect Escapist" ac...
	Easy "The Piper" achievement...
	Various Steam Achievements...

Read all three jokes on the left side of the toilet in the cabin to get the "Funny Man" achievement.

Save the game near the end, before completing it for the first time. Successfully complete the game, then reload that saved game file. Complete the game again, and watch the ending sequence to get "The Perfect Escapist" achievement.

Find the rat under the cupboard in the locked room. Use the "Look At Tool" multiple times on the rat to talk to it and get "The Piper" achievement.

Achievement	How to unlock
Big Stick	Get the baseball bat.
Funny Man	Read all the jokes in the graffities.
GateKeeper	Get the key to the warehouse.
Incendiary	Start a fire.
Introduction	Start a new game.
Lady Killer	Talk to the girl.
Marathon Runner	Finish the game in less than 4 hours.
Nuisance guy	Make someone angry with you.
Off down!	Watch out for things falling on your head.
Perfect escape	Learn How to Rappel.
Sweet Dreams	Everyone loves a good sleep.
The Caterpillar	Make a duct tape caterpillar.
The Escapist	Finish the game.
The perfect escapist	Finish the game for a second time.
The Piper	Hypnotize a rat.
The Riddle	Finish the game without using the hint system.