After some tries i got the answer and got the achivement.
During the fight with Tae-Sung, you need to use the action keys on the spirits as it is explained on the wiki. Not only kill Tae-Sung
Wiki : "
For those having trouble with this part of the collection use the below steps:
At 66% and 33% Tae-Sung will phase. This is also marked by Kyung saying "What a coward! He's hiding in the spirit world."
Grab the Special Action by interacting with the bells around the shrine.
Move to Kyung and press F to 'Phase'
Move to Spirits next to Tae-Sung and activate the Special Action key
Lastly, collect the spirit essence in the area around Tae-Sung, appearing as red baubles.