How to get the achievement "Lost Letters"?

Question

I heard that a new secret achievement called "Lost Letters" was recently discovered.

How can I get it?

Answer 1

Hello, in order to obtain the achievement Lost Letter you must read all the personal letters from the Ada's island mini-bosses (Clavius, Michael and Adlerauge). Each one has 3 personal letters that you can obtain from killing them.

Ps: The letter is not consumed after reading, so you can land to friends so everyone get the achievement

Ps2: I still lack some letters, as soon as I get every one of them and obtain the achievement I'll add the print here