How about we fix the existing ones before we add new ones 
But in the interest of fun lets throw some out there:
Army of Cedrics
Patiently collect 100 cedrics without accidentally disenchanting him
Egg-y goodness
Get more than 4 of any single dragon from a soulforge dragon egg
You’re wasting your money
Ascend all of the treasure troops to mythic, unlock all traits, and add gold medals
Who you gonna call?
Defeat a pet gnome while your guild already has an active pet rescue
The one that got away
Lose your pvp battle while there is an active pet gnome in the fight
I’m hunting for buried treasure
Play 20 treasure hunt games in a row
Geoff is NOT a legend
Mistype “Geoff is a Legend” in the global chat 3 times
Jealous? Not me
Be the first in your guild to unlock the new Friday mythic
Take the easy way out
Only play gate battles in Guild Wars
Would you make up your mind already?
Join and leave 4 guilds in a week
Capital L for Loser
Fail to make a perfect run in dungeon 7 times in a row
It’s just not gonna happen for you
Open 1,000 glory, gem, guild, or vip chests in a row without receiving a mythic
Faction distraction
Lose 3 pure faction battles in a row
Limping across the finish line
Win your faction delve with only one troop left
Leeroy Jenkins!
Win your faction delve with a single troop equipped for all battles
Co-ladder-al damage
Place 4th place in your weekly PVP ladder
I’ll never get bored of the board
Have 12 different types of gems on the board at one time