Here is the full list of all 21 Jacob Jones and the Bigfoot Mystery : Episode 1 achievements.
Earn maximum merits for Episode 1
Complete 'Circuit Training' in less than 9 moves
Complete Episode 1
Complete 20 puzzles
Complete 'That Ain't Sitting Right' in less than 13 moves
Collect all Gnatgobblers
Collect all soda cans
Reach the Airfield
Earn 40000 merits
Complete 'A Note of Friendship' in less than 6 moves
Meet a Bigfoot
Complete 10 Puzzles
Survive the First Night in camp
Complete 'Rolling Blunder' in less than 27 moves
Collect 40 soda cans
Collect 3 Gnatgobblers
Complete 5 puzzles
Earn 10000 merits
Complete 'Pack Mentality' in less than 9 moves
Complete 'Log Jam' in less than 12 moves
Complete your first puzzle