I was given the task to buy an implant and use it in combat which I did but the task doesn’t complete.
it’s a known bug
[http://forum.star-conflict.com/index.php?/topic/22258-mission-road-to-success/](< base_url >/index.php?/topic/22258-mission-road-to-success/)
Actually, it was fixed, and got broken again. It should be fixed again in the next patch.