Here is the full list of all 21 Catan Universe achievements.
Win 5 games with the Cities&Knights expansion.
Build 3 city walls in a game of Cities&Knights.
Finish the introductory game of 'The Duel'.
Create a guild or join one.
Change your looks with the avatar editor.
Reach level 20.
Win a game, where you have both the Longest Road as well as the Largest Army.
Win a game without building a city.
Reach level 10.
Reach level 5.
Reach karma level 4.
Build a road that is compromised of at least 12 sections (including ships).
Finish the tutorial of the base game.
Reach level 2.
Use your first ticket.
Add your first friend.
Win 5 games with the Seafarers expansion.
Uncover 10 fog tiles in a game of Seafarer.
Move the pirate 5 times in a game of Seafarer.
Play the progress card 'Wedding' 10 times in your games.
Colonize all islands in the Seafarer scenario "The four islands".