Here is the full list of all 40 Mayhem in Single Valley achievements.
Rescue 16 duct tape clones.
Find 16 collectables.
Cure with explosives.
Cure Bob's pet rat.
Catch a fish.
First upgrade.
Use log cutter to cut down a tree.
Rescue your first clone.
Help an old lady.
Go beyond the fence.
Swim in neighbor's pool.
Find your first collectable.
Give Mom a flower.
Rescue all falling passengers.
Free the spider.
Find all 64 collectables.
Rescue 32 duct tape clones.
Rescue 64 duct tape clones.
Help a swimmer in need.
Complete clone labs without killing a clone.
Cure a rhino.
Cure a gorilla.
Cure a lion.
Cure a bear.
Cure a monkey.
Bring Pops to Maud's grave.
Bring Bob back from the dead.
Upgrade something to max.
Max upgrade Jack.
Save Single Valley.
Survive the zoo.
Find 32 collectables.
Rescue all missing children.
Find the cave painting.
Complete the golf cart mini-game.
Escape The Void.
Break a wall with the wrecking ball.
Protect the mega batch.
Help Miss Jenkins out.
Help Verity with her quest to find true love.