In the picture you provided, the first missing accessory is the single version of the untamed captive piercings(double), so just get back to the Old Ruins in the stream(the 1st main scene), attach only ONE trap to Kiv then go to the Shaman's, remove it with a crystal.
The second missing accessory can be found in the 1st Sub-region, the Jungle Detention Center(or similar name?), get caught by the trap area, the accessory will be on the chest, then the Shaman's，crystal……
By the way, can you tell me where to find the second-to-last one among all the accessories? That's the last for me, thanks
ps, I might not give the the exact name of scenes because I only tried CN/JP version, thought it's ok as long as u get me idea, I wish