The achievement system is really out dated. You can't get certain achievements that you could get before because of updates. This issue needs to be fixed soon, as it is most likely blocking a lot of knights from getting all of his or her achievements complete. For example, as far as I know, you can't deposit minerals into a gate anymore. That makes it impossible to earn the following achievements; Minor Miner, Moderate Miner, Major Miner, Marvelous Miner, and Master Miner. Those are 5 achievements that can no longer be earned. Another achievement you can't earn due to updates is the Walk It Off achievement (From a while back.) due to the sparks of life and no health share revives. I was thinking, maybe you should get something usable for earning these achievements before they were removed. I was thinking of something along the lines of a gem sword for the miner achievements since there are 5:

★☆☆☆☆: Crimson Sword: Normal Damage ----- Minor Miner
★★☆☆☆: Valestone Sword: Normal Damage ----- Moderate Miner
★★★☆☆: Luminite Sword: Piercing Damage ----- Major Miner
★★★★☆: Dark Matter Sword: Shadow Damage ----- Marvelous Miner
★★★★★: Moonstone Sword: Elemental Damage ----- Master Miner

As for the walk it off achievement, there could be a five star armor of the vitasuit with a special effect (Not able to be crafted, of course.) The health boost would increase the player's health by 8 and be named "VitaSuit Maximum." The special effect is the ability to revive players via health share.