Here is a run down of some of the basic collection achievement rewards in Guild Wars 2. The difficulty of completion ranges from easy to moderately time consuming.
Uncanny Canner – A basic collection achievement that requires collecting 11 themed jars from vendors around Tyria. Most of the jars can be purchased from the vendors for a small amount of karma.
Reward: “Uncanny Jar” 20 Slot Bag
Bandit Weapon Specialist – A basic collection achievement that requires unlocking all of the bandit weapon skins. The collection itself is unlocked by consuming a Bandit Combat Journal that can be purchased in The Silverwastes. There are 19 bandit weapon skins total that must be unlocked. A cheap way to acquire them is to visit the WvW weapon trader who sells them for karma. The cost for a level 1 character is 400 karma, while the cost for a level 80 character is 20k-40k karma.
Reward: “Bandit Coin Purse” 20 Slot Bag, among other loot.
Utility Utilizer – A basic collection achievement that requires obtaining six specific utility consumables. These can be purchased from the trading post for 16-50 silver each.
Reward: Utility Primer
Fine Wining/Fine Dining – Basic collections that involves drinking 9 different wines and eating 14 different types of steak, respectively. The fine wining collection must be unlocked by purchasing a guide in Rata Sum, and the fine dining collection is unlocked when you consume any item in the collection.
Rewards: Metabolic Primers
Brewmaster – A basic collection achievement that requires consuming 18 different ales around Tyria. The collection is unlocked by purchasing a guide in Lions Arch.
Reward: Metabloic Primer
**Below collections are holiday dependent**
Wintersday Toy Weapons Collection – As the title suggests, you must collect various wintersday toy weapon skins. This collection is unlocked by obtaining a Heirloom Toy Chest.
Reward: Mini Skritta Claws
Tricks and Treats – This collection is unlocked by using the “Old Pillowcase” which can be purchased from the trading post. To complete this collection you must consume 19 Halloween themed items.
Reward: Mini Candy Corn Ghoulemental