I need a lot of feats

[With a box]

how many feats can I have at 20th? 20?
you can use flaws, but feats from flaws are not count for this (or we can get NI feats from NI flaws)

[Deox]

If retraining is allowed, Elf can net you 4 at 1st level (swap out longsword, rapier, longbow and shortbow). First level fighter grants one bonus. A first level elven fighter could have 6.

[Biffoniacus_Furiou]

Cast Heroics (SC), you temporarily gain one fighter bonus feat.

Cast Embrace the Dark Chaos (FC1), you permanently lose any one feat you currently have (the one from Heroics) and permanently gain any abyssal heritor feat from that same book.

Cast Shun the Dark Chaos (FC1), you permanently lose any one abyssal heritor feat you currently have and permanently gain any one feat you currently qualify for.

Each of the latter two spells costs 250 xp to cast, but otherwise this gets you NI feats.