Enchantment IV

My idea for this achievement was crafting Small/Large Prismatic Shards

Recipe: Formula: Large Prismatic Shard and Small Prismatic Shard Since it technically costs nothing (You use 1x Prismatic Shard to craft 3x Small prismatic shards, you then use the 3 small prismatic shards to craft 1x Prismatic shard and so on..)
If you do this i would suggest buying like x50 Prismatic Shards and make sure to put both Recipe's/enchants as your favorite so they are listed in the top
You could also just craft 2000x Minor Health which simply costs 2k Strange Dust

Completed using the Large Prismatic Shard and Small Prismatic Shard craft to cheese this, you can spam this macro and rather than swapping back and forth
You need to have your enchanting window open
/run local id = 28022; C_TradeSkillUI.CraftRecipe(id,C_TradeSkillUI.GetRecipeInfo(id).numAvailable)
/run local id = 42615; C_TradeSkillUI.CraftRecipe(id,C_TradeSkillUI.GetRecipeInfo(id).numAvailable)

I bought 8000 Spirit dust and crafted 2000 Mastery enchants. cost me 30s a dust on AH. Easy peasy :D