It’ll be like the umpteenth time I show this off / talk about it, but my biggest achievement was getting Enkidu to Bond 10:
Enkidu is really dear to me because it’s thanks to him that I’m here, playing this game. He’s the one that got me interested enough to get back to playing. As soon as I saw him and learnt how the game worked, I knew I had to get him. And get him to lvl 100. And 10/10/10 (on my way). And bond 10… When the new game setting that lets you reach Bond 15 for Servants, I am 100% going to get him to Bond 15, even if it costs me years. Wish I had him in JP too… maybe one day?
So yeah, Enkidu’s bond 10 is the greatest achievement for me. It took me 6 months, but worth it.
I guess I also have other smaller achievements, like when I max-ascended my Cú. Considering I was sooo short on Octuplet Crystals, and Cú needed them, maxing one of my favourite F/SN characters was a small but sweet accomplishment back then.
Same for getting Diarmuid max-ascended. I have to admit I haven’t used him that much, despite being my favourite in Fate/Zero, but I had to level him up because he’s big husbando. At least just to show off my love for him. So, another good achievement.
On the same topic as mats, back during Guda Guda Meiji event and CCC, I spent most of the time (when finished with the main event) farming for Crystals, and thanks to Event shops, I managed to get my Octuplet Crystals up to 100. That’s a really good achievement, since I’ve always been lacking on Crystals ever since I started playing, because most of my favourite Servants need them to level them up.