With the Shell Shock update we added some new Achievements to the game. One of them being 'Turtle Power' which you earn from owning one of each rarity of Turtle's Loadouts. Currently, if you complete these requirements you will NOT unlock the Achievement due to a bug.
We will be fixing this in an update (planned for July* 25th).
In the meantime, if you unlock these cards, HOLD ONTO THEM! We'll do a check and grant the Achievement to all players who meet the requirements shortly after the update goes live. If you do not have all of the required cards at the time of the update, you will NOT receive the Achievement, whether you had them beforehand or not.