Judging from that list he delights at murder, enslaving someone, causing or witnessing torment, violence and mayhem. He also likes when the PC says they consider Astarion to be in their confidence, likely because it means he can con them later if he needs to. He’s a Masochist, in that he believes there’s the party who has the power in any interaction and that gives then leave to do what they will.
Complaining about being heroic isn’t evil per se, but we can infer from his remarks and this list what Astatrions personal actions would be.
I didn't interpret that list in any way close to what you're saying.
He delights in murder and enslaving people?
You seem to be presuming his motivations pretty openly. This strikes me more as a foregone conclusion than an unbiased consideration.
