"valll vallll will you share your extensive list of achilles headcanons please" said absolutely no one. aw well i'd love to indulge you ☺️ (spoilers for all of the books that he appears in below)
> human furnace; in poke's gang the younger kids would lay on his arms during the colder nights because he is warm and emits heat like a pocket-warmer (and they also wanted papa. i guess) (he didn't enjoy how numb and sore it made his arms in the morning, but it also inflated his ego in a way)
^wears socks to bed despite this
> (ty to nadia for this one!) also in his rotterdam days, pre-poke's gang: whenever he got a hold of spare change, achilles would wait to save some up, then visit this one particular arcade and play on the machines until his money ran out (this made him decent at computer games, & was a minor part of the sway factor when it came to enlisting him at BS... not to say that it made him a 100% viable candidate, but it did help)
> was given meds in the mental hospital for mood regulation, but he didn't like how they made him feel so after a while he only pretended to take them
> worst diet known to man; solely eats rice paper or some other barebones & easily-available snack when busy, especially in the indian compound
^ (pre-BS he was big on enjoying food, but with his subsequent institutionalization, his view on eating became "it doesn't matter what i eat as long as it keeps me sustained enough to focus on doing what i need to do" and "enjoyable food should be eaten when you're actually enjoying yourself". so that's that. he doesn't really seek out good food, moreso eats whatever he's given (this is sort of echoed w/ his bread thing when he was a papa). the hegemon's complex in ribeirão preto was the best achilles had eaten in a long time, and the majority of that is because peter was dragging him off to lunch dates and getting him to eat things of actual substance)
^potato chips are reserved for better command days, and they became his main snack during that stint when he was in control of peter's compound. not sure what his favourite food would be, but i'm thinking it would be something basic yet hearty that he first tried in that private catholic boys' school. that being said, he'd love sour candy
> would enjoy watching pig races. chicken fights too. placed bets on them a few times in rotterdam & only stopped once he lost for the first time. how unethical...
> his favourite colour is red :) really stereotypical for a murderer but whatever :) he just likes its vibes :)
> doesn't care for animals, though he does enjoy petting cats when he passes them by (there are lots of strays in ribeirão preto; he appreciates how soft and non-obtrusive they are, especially in comparison to other domesticated animals (cough cough dogs))
> somewhat wary when crossing roads because of the times he's witnessed children getting run over by cars in rotterdam (he had to have gotten his idea for ulysses' beatdown excuse somewhere!). of course no one knows about this but him. hashtag anti-pedestrian life
^back to the dogs thing: he feels the same way about them for similar reasons (specifically, the rare aggressive starved ones on the streets that'd eat anything in desperation, or the ones with rabies)
> since achilles is the kind of guy to act like "yes👍 yep👍 sounds good👍" in any social setting where he's expected to be equal/inferior to others around him, in a modern hs AU one of his "friends" (read: classmate who finds him fun and reliable even though achilles barely even remembers that they exist) would ask him if he'd be up to join their school's theatre production because they're short on a few actors and he'd be like "Sure Why Not" (insert placating smile). well it turns out that he's a good actor and he figures out that it's actually a little fun... so he lands the role of male lead for the next show
^i also love how whenever he is pissed off by basically anything he just plays it off. he'd hate loud music and he'd hate his one-sided friends blasting it from their bluetooth speakers or vehicles but when they ask him what he thinks of it he's like "wow that's a cool song :) " (<- lying straight thru his teeth) (<- plotting a way to break their devices without them noticing)
> (obligatory pride month headcanon) aroace. as i've said. yes he was genuinely infatuated with petra 👆 but in his very own weird special way.