Here's the ones I think are ok with numbers that I feel are reasonable.

Pets
  • Collected 400 (total 435)
  • Collected 50 arcane (total 69)
  • Collected 1, 10, 25 mythic (total 38)
  • Collected 1, 10, 25 arcanite (total 42)


Kills
  • PvE: 100, 500, 1000, 5000, 10000, 50000, 100000, 500000, 1000000


Slots (will need to verify limits)
  • Standard Inventory 100, 250, 500
  • Crafting Inventory 100, 250, 500
  • Furnishing Inventory 100, 250, 500
  • Stash 100, 250, 500
  • Crafting 5, 10, 25, 50
  • Auction 5, 10, 25, 50


Item
  • Crafted 10, 20, 50, 100, 200, 500, 1000 items
  • Crafted 1 flawless jewel (NOTE: 1 Flawless jewel for EVERY type of jewel)


Looted
  • Gold from mobs 1000, 10000, 100000, 1000000, 10000000


My additional APs
  • Completed all side quests for Brakenridge campaign
  • Completed all side quests for Ydra campaign
  • Completed all side quests for Dead city campaign
    (I think you understand where I'm going with this)