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