Here is the full list of all 15 The Stranded Traveler achievements.
Kill 25 enemies
Try your luck at the Gambler
Win once at the Gambler
Kill Elemental Boss
Drink a potion
Pickup an enemy drop
Finish a level with 100 or more HP
upgrade something at the alchemist
Open a coin chest
Complete the moving water and wall run
Upgrade your characters HP
Visit another planet
Find out who corrupted the earth
Destroy an astroid while flying a spaceship
Destroy the corrupter of the earth and remove them from power