KanjiJLPT N1
Fine

fine (i.e. not coarse)

Mnemonic

grandma would do humbly what others rushed through. While they cut corners, she sat quietly embroidering, placing each stitch with breathtaking precision. Everyone who saw her work gasped—it was impossibly fine, every detail so intricate it seemed alive. Grandma's patient hands did humbly produce masterpieces.
Additional thoughts
Picture grandma bent over fabric, squinting through her glasses, threading impossibly tiny stitches. The humility of her approach is what produces such fine, meticulous results. Patience + humility = exquisite detail.
Quick recall
grandma would do humbly her stitching, producing impossibly fine detail.

Details

The keyword for 緻 is fine. This kanji conveys the sense of something being extremely detailed, delicate, and minutely crafted. It refers to a high degree of precision and intricacy, as in work or texture that is closely and carefully done. It is most commonly encountered in compound words expressing meticulousness and thoroughness in quality or execution.
On'yomi
Kun'yomi
こまか.い