Star Ocean: The Last Hope

The game keeps track of every item you make for the first time. Since there are 321 different items, you must make 257 to unlock this achievement (which is a tiny bit more than 80%).

I recommend keeping track of what you make right from the beginning of the game (something I didn't do), so that you don't have to try to remember later what you've made and what you haven't. Something you can do is use the Memory Plate ship furnishing to see how many different recipes you've made at least once (and if you have a Memory Plate, you can scratch that item off your list, heh).

SPOILER(ish): If you are going for 100%, make sure you get these four recipes with Faize while you still have him:

- Iron Saber
- Elastic Rapier
- Rune Saber
- Onyx Saber

Also, when you start getting to the really hard items (the ones that require Scales and Moonstones and whatnot), just wait until you get the Duplication skill in Cave of the Seven Stars. Then all you'll need to find is Magical Clay.

The fastest way to farm Magical Clay is to steal them from the Bone Knights in the Seven Star dungeon. Teach Myuria the Steal skill and max it out. Synthesize three Slayer's Bangles to a fourth Slayer's Bangle (which grants several extra attacks per attack). Equip this on Myuria. Go to B1 of the SSD. One of the very first enemy groups you see will be Bone Knights. Kill any other enemy groups around the Bone Knight (you won't be using Ocarina, so don't worry about them coming back). Once you have just the Bone Knight group, turn everyone on Manual (except for Sarah, put just her healing symbols on), enter the battle and use Myuria's forward+A attack on the skeletons. Quite often you'll steal Magical Clay, but sometimes it's a Hyper Potion. Once you've stolen one item from each skellie, run from the battle (Bonus Board be damned!) and re-enter the battle and repeat.

You will get annoying bees mixed in unless you keep getting Preemptive attacks, but Preemptive attacks also mean less skellies per battle. If Sarah is strong enough to outlast the bees, enter the battles normally, otherwise play it safe.

Another thing to note, as you are probably trying to craft the really rare recipes at this point, is that you cannot duplicate any Superboss Feathers, and must defeat each one five times.

Otherwise, just make sure you use that link that Ater Magus has.