Necropolis

This achievement will unlock after you purchase your first codex. This can be done by acquiring the tokens earned from completing the secondary objectives or progressing through the levels without dying. The codexs are purchased at the stack of books at the level you load in on with a new character just opposite of the floating gold pyramid or at the end of each level at the stack of books. The minimum number of tokens needed to purchase one codex is 3 tokens.