Here is the full list of all 13 Owyn's Adventure achievements.
You found the first part of your train set
You found the second part of your train set
You found the third part of your train set
You found the fourth part of your train set
Send a Wasp packing!
You found a sword!
You found Grandpops! At last!
Beat the Mole boss without losing a life
Walk with Grandpops to the lift
Found all the Trainset pieces and got an extra life
Find the hidden heart in the Labs
Defeat a Mole
Congratulations, you completed game! Thanks for playing!