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