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