Here is the full list of all 14 The Great Perhaps achievements.
Hear what the teddy bear has to say
Repair the unusual machine
Treat Carl to his favourite formula
Don't worry, no animals were harmed
Give hope to the desperate writer
Save the hostages
Help two lovers get together
This is where the fun part begins
Get rid of all time anomalies
Find out who's waiting for you at home
Find all hidden keys
Catch a ride
Make the spoiled child happy
Finish the game