Here is the full list of all 13 Avalon achievements.
You got to see some of Penny's backstory.
You got to spend time with Maize!
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.