NieR Replicant ver.1.22474487139...

For this trophy, you'll need to pick up at least half of all of the "Words" availabe in the game. The "Words" are dropped off of enemies (they'll appear as a large green orb that you'll automatically pick up). These are used to enchant your weapons and magic with a variety of stats. There's a pretty good chance you won't get this until you play through Part Two for Endings C or D due to the sheer amount of words available. Luckily, though, you can increase the drop rate of these by actually using the Words you've already collected. 

Open up your Grimoire and head over to "Word List Edit". Select any weapon and magic that you currently have equipped. There will be two slots available per item; one will give battle-related stats (attack power, increase magic, etc), and the second slot will give a miscellaneous stat (increase XP, increase drop rate, DoT, etc). Of course, we are looking for any that "increase drop rate". There is a set of words that will do the trick and will range from an increase of 5%, all the way up to 30%. Just equip whichever one gives the highest % on each equipped weapon and magic. A little bit goes a long way with this so you should see a noticeable difference in not only the drop rate of Words, but all general mats and pots that drop from enemies. 

The words you're looking for are as follows:

You can check your progress towards this trophy by going to "Word List Edit" in the Grimoire. On the first menu will be a %. This is the % of words you have collected so far in the game. As soon as it reaches 50%, the trophy will unlock.