As already said, you need to craft every items at crafting tables but first of all, your account needs to be level 54 in order to unlock all items.
Once you are level 54, you will need 3250 materials (green ones) and 750 special materials (blue ones). You can check your materials in the score table.
I had enough materials at round 23, but it could be less or more. I crafted every items in a row and the achievement popped after the last craft.
Also, I find that the drop of the special materials was more consequent using a special weapon (I had the ray gun and the D.I.E Machine) but nothing is proven for the moment. It is only my personal feeling.
Good hunting !
(I hope my English is good enough )