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