ill go for the weapons and armor i remember using for bosses ive defeated
console
in 1.1
EoC: iron armor, throwing knives, shuriken, wood bow with jester arrows
EoW: forgot gear i used
skeletron: molten armor, flamarang
WoF: molten armor, star cannon, sunfury, pheonix blaster, fiery greatsword
destroyer: adamantite armor, adamantite glaive, dao of pow
the twins: adamantite armor, megashark with crystal bullets
in 1.2 (1st release)
BoC: forgot gear i used
golem: turtle armor, forgot weapons used
1.2 (after patch)
plantera: forgot gear i used
skeletron prime: turtle armor, paladins hammer
mobile
initial release
EoC: silver armor, forgot weapons used
EoW: gold armor, forgot weapons used
skeletron: shadow armor, flamarang
WoF: molten armor, dark lance, nights edge
in 1.1
destroyer: adamantite armor, adamantite glaive, nights edge
in 1.2
plantera: hallowed armor, gungnir, true nights edge, light disc, golden shower
the twins: hallowed armor, venus magnum with explosive bullets