Here is the full list of all 20 Adventures of Pip achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Purchased an Item in the Item Shop.
Purchased a Heart Container in the Item Shop.
Rescued all villagers in a single level and received a PERFECT rating.
Rescued all the villagers in the Scarab Forest.
Rescued all the villagers in the Maddening Marsh.
Rescued all the villagers in the Galena Caverns.
Rescued all the villagers in the Lava Labyrinth.
Rescued all the villagers in Queen DeRezzia's Castle.
Defeated the Queen Grub in the Scarab Forest.
Defeated the Temple Heart in the Maddening Marsh.
Defeated Cragken in the Galena Caverns.
Defeated Lord Magmalith in Lava Labyrinth.
Defeated Queen DeRezzia in her Castle.
Collected 11,240 pixels in total.
Purchased an Upgrade in the Weapon Shop.
Purchased all available Upgrades in the Weapon Shop.
Purchased all Heart Containers in the Item Shop.
Completed 50% of levels with a PERFECT rating.
Completed all levels with a PERFECT rating.
Completed the game.