Shot in the Dark

Get a critical hit on a target who has total concealment from you.

Blaster Master [20]

Kill 100 enemies with magical attacks.

Kick Them When They're Down

Get a critical hit on a prone target.

Resistance is Futile

Completely resist an enemy's attack that deals fire, force, poison, thunder, cold, lightning, radiant, necrotic, psychic, or acid damage.

The Survivor [20]

Win an encounter as the only party member left alive or conscious.

Just a Flesh Wound

Receive damage greater than your bloodied value and do not fall unconscious.

The Doctor Is In

Restore an ally's hit points from negatives to positives 15 different times.

Hated By Fate

Fail 5 saving throws in a row.

Spinning Piledriver!

Kill an enemy with falling damage while grabbing it.

Tubthumping

Be reduced to negative hit points twice in a single encounter.

Long Way Down

Fall at least 100 feet and survive. [Heroic]
Fall at least 200 feet and survive. [Paragon]
Fall at least 300 feet and survive. [Epic]

Wizard in Fullplate

Survive an encounter while wearing armor you are not proficient with.

Weapon Master

Use three different weapons during a single encounter.

Untouchable [20]

Go an entire game night without taking any damage.

Suicide Bomber

Use a damaging area power when you are in the targeted area and a valid target to be hit by the attack.

Three Strikes You're Out

Miss three attack rolls in a row.

Pacifist

Go an entire encounter without damaging an enemy.

Not So Fast

Kill an enemy during their turn.

Ninja Assassin

Kill 5 enemies in a single attack.

Master Defender

Prevent over 25 damage to allies in a single encounter. [Heroic]
Prevent over 50 damage to allies in a single encounter. [Paragon]
Prevent over 75 (or 100?) damage to allies in a single encounter. [Epic]