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Shadow Archer:

Shadow Archer Cuirass: is found if you side with willy against the assassins, and kill them.

Shadow Archer bracelet: was found in the jewelery box in the room where Abbott was trapped in, inside the forgotten crypt.

Shadow Archer: pants were in a chest in a small treasure room in the temple of nimir

Shadow Archer: gloves were in a chest in the healer house, after mind reading the guy lying by the door in the bed.



You missed the Helm, which is:
In a chest to the right of where you enter the source square part in which the Engineer is (just look right and up and you will see it - or just pay attention to the cinamatic depicting what you should do to defeat the
Engineer)

One can only know how far he can go by going too far.