Starting an official Medal list, separate from the brainstorming topic.
Images will be added as they are created!
Destroy all Characters your opponent controls with at least an Overkill.
Take no damage and win a duel.
Defeat a Legend Zero staff member at H4Ck3Rs_
Destroy 20 Characters without losing a character.
Destroy 6 Characters in a single turn.
Win a duel in the first turn.
Destroy 2 Characters in a single turn.
Destroy 3 Characters in a single turn.
Destroy 4 Characters in a single turn.
Destroy 5 Characters in a single turn.
Upload 2 Characters in a single turn.
Upload 3 Characters in a single turn.
Upload 4 Characters in a single turn.
Upload 5 Characters in a single turn.
Destroy 3 Characters without losing a character.
Destroy 5 Characters without losing a character.
Destroy 10 Characters without losing a character.
Destroy 15 Characters without losing a character.
Activate 3 Programs without being negated.
Activate 5 Programs without being negated.
Activate 10 Programs without being negated.
Activate 3 Firewalls without being negated.
Activate 5 Firewalls without being negated.
Active 10 Firewalls without being negated.
Activate 3 Upgrades without being negated.
Activate 6 Upgrades without being negated.
Activate a Sector without being negated.
Overdrive a Character you control.
Cancel your opponent's Overdrive.
Negate your opponent's card.
Prevent the destruction of a Character you control from battle.
Destroy a character that defeated your Character in combat last turn.
Directly attack your opponent when they control Characters in the opposite world.
Upload a character with a REQ of 5 or more.
Injure and destroy a Character in the same Battle Sequence
Destroy an opponent's Character with a card effect.
Take control of an opponent's Character.
Empty your opponent's hand.
Destroy the first Character of the game.
Win a duel by with than 1000 Power Points remaining.
Inflict 5000 or more damage in a single turn.
End you opponent's streak (any streak).
Win a duel with 9001 Power Points.
Win a duel with over 15000 Power Points.
Win a duel without destroying a Character in combat.
Win a duel without activating a non-Character card.
Last Man Standing
Win a duel without your first uploaded Character being destroyed.
These will all be available on your Player Profiles once 1.1 goes live with the Medals update. These will be added and phased in as they can be automatically calculated. I'll update this list as new medals are added.