Here is the full list of all 16 DROD RPG: Tendrys Tale achievements.
Find a secret potion on the way home
In "Rule 6: Boldness"
In "Rule 7: Might"
In "Rule 3: Valor"
In "Rule 5: Bravery"
In "Rule 4: Honor"
In "Rule 8: Flair"
Completed "Homeland"
Completed "The Goblin Tribe"
Completed "No-man's Land"
Completed "Pirate Lair"
Completed "Preservation of Tueno"
Defeat the hidden Archivist boss
Get a potion behind a field of bombs
Find a secret treasure chest by a DAA floor seal
View the "End game" screen