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