Here is the full list of all 50 Doughlings: Arcade achievements.
Show Off with Robo 50 times
Show Off with Gunner 50 times.
Show Off with Spook 50 times
Show Off with Webster 50 times
Show Off with Smash 50 times
Show Off with Bedrock 50 times.
Morph 75 times to Robo.
Fully upgrade Spook.
Fully upgrade all heroes.
Morph 75 times to Webster.
Morph 50 times to Spook.
Complete all Secret levels.
Complete 75 levels with 3 stars.
Complete 75 levels.
Teleport your ball 50 times between wormholes.
Fully upgrade Bedrock.
Heal 50 Psychos.
Shot 50 Killers.
Morph 75 times to Gunner.
Fully upgrade Webster.
Unlock all heroes.
Banish 100 Ghosts.
Complete 50 levels.
Fully upgrade Robo.
Morph 75 times to Smash.
Morph 75 times to Bedrock.
Heal 50 Flu targets.
Shot 500 bullets with Gunner.
Fully upgrade Gunner.
Bounce ball from hero 5000 times
Catch 100 balls with Robo
Save 100 Stuck targets.
Show Off with Morpheus 100 times
Complete 1 secret level.
Bounce ball from walls 10000 times.
Fully upgrade Smash.
Show Off 100 times.
Complete 25 levels.
Heal 500 Red targets.
Morph 100 times.
Destroy 100 Petrified targets.
Fully upgrade Morpheus.
Fully upgrade any hero.
Heal 500 Yellow targets.
Heal 500 Green targets.
Heal 500 Blue targets.
Upgrade any hero with one slot
Die 10 times.
Complete a level by clearing the screen before the time runs out.
Get your first 3 stars.