How to Unlock The Inner Crypt Achievement
To get this one you need to pass through the Shaper Crypt and enter the Inner Crypt. You will need to be a decently high level to get this and collect the two orbs that will unlock the door. The two orbs can be obtained by killing specially marked Thahds in the Western Wastes map and the Drayk’s Vale map. They may not always spawn, so it is likely you will need to go back a few times to check for them.