Many achievements require you to go around the world to collect or interact with scattered or hidden landmarks or items. These are some of them, including the current Living Story ones if available. When in game, enable the general option Show All Usable Object Names to see the item's name appear. Use the overlay GPS program for easier search.
Every type of collectible is its own checklist. The map markers can be clicked three times to alternate between three ring colors representing an Unfound, Tracked, and Found state, and your address bar will be updated with a shareable URL for those marked. Click Reset for all the rings of that collectible type to be Unfounded again.
To convert the map needles into workable pins, click the collectible's image icon from the list.
Coordinates credit goes to:
BoyC: Noxious Pods, Supply Caches, Airship Cargo
Dulfy: Mastery Insight, Strongbox, Dive Master, Cleaning Up the Neighborhood, Marriner Plaque, Coins, Caudecus Letters, Cin's Goods
Mattsta: Buried Chests, Coins
Palingenesis: Pets, Pumpkins, Paper Scraps, Exalted Chests, Totems, Seals, Tablets, Masks, Badges, Bandit Chests, Speedy Reader, Matrix Cube Key
Ranger Pets
On the map: Click on a pet icon to cycle its ring color and "check them off"; right click to zoom in/out.
On this list: Click on a pet icon to view that pet only, click again to show all pets; double click to view its wiki. The smaller icons are facts for the pet's unique user-activated skill. Turn on the game option "Show All NPC Names" under General Options to always see pet names in game.