Here is the full list of all 42 Dogu the Adventurer achievements.
Deliver your first cargo
Repair Dogu's sword 3 times
Repair Dogu's armor 3 times
Repair Dogu's shield 3 times
Make repairement 9 times
Upgrade Dogu's sword 3 times
Upgrade Dogu's sword 5 times
Upgrade Dogu's armor 3 times
Upgrade Dogu's armor 5 times
Upgrade Dogu's shield 3 times
Upgrade Dogu's shield 5 times
Upgrade all the equipments
Upgrade the equipments 9 times
Refuel 4 times
Upgrade the hull to max
Upgrade artillery to max
Upgrade fuel tank to max
Upgrade motors to max
Make all the ship upgrades
Open 12 chests
Collect 5 fuel crystal
Craft 6 potions
Craft 10 potions
Collect 12 herbs
Collect 20 herbs
Kill 25 enemies
Kill 50 enemies
Kill 80 enemies
Kill 115 enemies
Find 6 story notes
Find all 3 recipe
Deliver all the cargos
Use the first portal
Leave the Ring World
Leave the Snow World
Leave the Desert World
Leave the Tree World
Leave the Lava World
Face with Dreigem
Hunt birds for pig guy
Defend the village where blonde big waits
Hit the pigs