Here is the full list of all 22 Along Together achievements.
Find a treasure.
Bring Rishu home.
Find every treasure in the game.
Find all treasures in the Forest.
Find all treasures in the Caves.
Find all treasures in the Junkyard.
Reach the end of the Caves.
Reach the end of the Forest.
Find 7 treasures.
Work with Rishu to cross the bridge in Level 2-1.
Don't leave the kid hanging.
Hit 20 targets with the slingshot.
See a shooting star.
Score 5 points on the handheld game.
Score 20 points on the handheld game.
Play with every treasure at least once.
Crush 5 cars in the junkyard.
Pet Rishu.
Complete Level 1-2 without shooting any birds.
Make a stalactite splash down in the water.
Knock down all the apples in 1-3.
Score 40 points on the handheld game.