I completed Sundered before learning there were hidden elder shard fragments, which are required to upgrade all 7 skills and for some of the achievements.
In the first region below the main hub, before the area’s boss and Sundered’s first main boss (not the minibosses) in the room with tons of lasers, in the top left corner is the first hidden elder shard fragment.
In the second region to the left of the main hub, go to the top of the extremely tall large cervase and slide down the right wall. You will go through a hidden wall to find the second hidden elder shard fragment.
In the third region to the right of the main hub, take the elevator all the way straight up, and just outside to the left of the top elevator stop is a hook. Follow that hook upwards to find the third hidden elder shard fragment.
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