https://forums.enmasse.com/tera/discussion/24749/known-issues-updated-04-16-2018

Need To Be Reported
These are not wide-spread issues and require more player reports to be resolved individually. If you are experiencing one of these issues, please contact TERA Support
There are still quite a few trophies and achievements that are being reported as not unlocking.
Please contact customer support with your Gamertag or Online ID, Region, Console Platform, Server Name, Character Name, and if possible the date / time frame you completed the trophy / achievement requirement.