Here is the full list of all 13 Avalon achievements.
Finished Act Seven.
You learned how to play Senet.
You met a Super Villain!
Finshed Act Six.
Finished Act Five.
Finished Act Four.
Finished Act Three.
Finished Act Two.
Finished Act One.
You got to see some of Penny's backstory.
You got to spend time with Maize!
The secret unlock code is megalodong.
Finished the Bonus Act.