Complete the following tasks to unlock the corresponding achievement. To
view your achievements and stats in Steam, select "Community", then "My
profile", then "View all my games", then the game and view stats.
Achievement - How to unlock
After the credits - Meet an old friend.
Another Perspective - Complete the game.
Final thoughts - Complete the game and witness the true ending.
I don't understand - Finish Mystery mode.
Impossible - Beat the impossible level in Mystery mode.
See what you've done? - Video games have feelings too y'know?
What are you doing here? - Go somewhere that was never intended.