Here is the full list of all 16 Newfound Courage achievements.
Complete the entire Return to Otherwhere DLC.
Fight to the death in the Silverpine Arena.
Complete the Lorebook.
Complete Newfound Courage.
Make Alex jump off Deadworld too many times.
Fed Jake and Alex some apples.
Make Alex eat sweets till he gets a stomach ache.
Clean up the last book the Blank Sending throws.