Not including add-ons attacks. (i.e. power strike).
green: no action due to not actually having stated an action. i.e. more likely to be errated.
Rending: on crit
Harmony: on crit
Reaper's Axe: on kill
Impailing Weapon: RBA on kill
Bladespell (bladesinger): MBA hit.
Flurry of Blows (monk): 1/round, hit
Wolf's Bound (iron wolf theme x3): encounter, melee hit
Spirit Infusion (shaman granted portion): at-will, standard.
Death From Two Sides (warlord granted portion): encounter, standard
Trailblazing Assault (ardent granted portion): power points, standard
Inevitable Shot (seeker granted portion): encounter, miss. Note that it's a free action utility power.
Reactive Shot: Daily, start a battle.
Long Night Scion. AP. Any cold power.
Anarch of Shyr. AP. MBA
Caiphon's Intercession: Boon Replacment. MBA for an ally.
Warpath Berserker: AP Charge
Let me know if i'm missing any.