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