Here is the full list of all 22 Draco Knight achievements.
Defeated your first great foe.
Defeat a great mounted foe
Defeat the slavers
Defeated the orc hunter and his partner
Defeated the reaper
Defeated the mounted wyvern rider
Defeated the orc knight
Spared the wolf
Saved the scout from a grim fate
Gathered a group of unlikely allies
Earn all achievements
Take your first taste of ambrosia
Take your first taste of manna
Completed the Game
Earn a new skill
Earn 3 skills
Earn all skills
Earn 10 skills
Collect 5 ambrosia
Collect 5 manna
Collect 10 ambrosia
Collect 10 manna