Here is the full list of all 13 Avalon achievements.
The secret unlock code is megalodong.
Finished the Bonus Act.
Finished Act Seven.
Finshed Act Six.
Finished Act Five.
Finished Act Four.
Finished Act Three.
Finished Act Two.
Finished Act One.
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.