Zevron

Alpha Strike
Assist your allies in reducing a non-minion enemy to 0 HP before it takes its first turn.

Terrain Tactics
Harm an enemy with falling or environmental damage.

Terrain Mastery
Finish off a foe with falling or environmental damage.

Denied!
Keep an enemy from being able to make any attacks on its turn.

Relentless Advantage
Make three consecutive attacks against the same target with combat advantage.

Unperturbed
Damage a foe while dazed, prone, immobilized, or blinded.

Battlefield Medic
Make a Heal check to help an ally in combat.

Drinks are On Me
Administer a potion to an ally in combat.

Very First Aid
Remove an ongoing damage effect from an ally before they take any damage from it.

Opportunity Knockout
Reduce a foe to 0 HP with an opportunity attack.

Artillery Interference
Make an opportunity attack against an artillery-role monster.

It's Super Effective
Deal extra damage to an enemy by hitting it with an attack that it's vulnerable to.

Meat Shield
Provide cover to an ally against a ranged attack.

I've Got Your Back
Reduce an enemy to 0 HP while it's flanking one of your allies.

Kool-Aid Man
Charge through a wall on your turn.

Kool-Aid Man this!
Force an opponent through a wall on your turn.

Better Part of Valor
Score this achievement when your party opts to leave the field of battle instead of fighting on to eliminate every opponent.

Double Team
Score this achievement when you use a readied action such that you and an ally attack with flanking on the same enemy on the same initiative count.

Dunno About You, But I’m Still Good
Score this achievement when you reach more than one milestone since your last Extended Rest.

Forgot the Safeword
Score this achievement when you are knocked unconscious.

Running the Gauntlet, or, I’ll Take You Down With Me
Score this achievement when you suffer three or more Opportunity Attacks in a single turn.

Walk the Plank!
Score this achievement when you cause an enemy to take falling damage from forced movement.

Warband Savior
Score this achievement when you revive two or more allies from unconsciousness in the same combat (or the same ally two or more times).