Abilities aka. Perks can be bought from Niac. You will first meet him in the Kitchen Level of Chapter 1.
If you want to get the "Phoenix" achievement in the same playthrough, you're looking at $135'000 you have to spend to get your 5 abilities. If you just want to get the cheapest abilities, you're looking at $110'000. I got that much money without spending anything at the beginning of the Boss Battle with El Roico (but this can be random, as drops are random. But not difficulty related, as you get more or less same money on different difficulties.)
This should be obvious, but I fell for it: The "Alco Remedy" ability/perk doesn't count for this achievement.