Here is the full list of all 42 Elemental War 2 achievements worth 1,000 gamerscore.
Unlock all items.
Use every active item at least once.
Equip a tower with an item.
Use an active item for the first time.
Defeat 1,000 monsters.
Defeat 10,000 monsters.
Defeat 100,000 monsters.
Finish your first quest.
Finish all quests.
Defeat your first elemental.
Combine at least two elements to form a new tower.
Combine three elements to form a new tower.
Get a bronze medal on a map.
Get a bronze medal on every map.
Get a silver medal on a map.
Get a silver medal on every map.
Get a gold medal on a map.
Get a gold medal on every map.
Get a platinum medal on a map.
Get a platinum medal on every map.
Get a crystal medal on a map.
Get a crystal medal on every map.
Reach the global bronze rank.
Reach the global silver rank.
Reach the global gold rank.
Reach the global crystal rank.
Defeat a monster right before the portal.
Survive a map.
Survive a map without losing a single life.
Survive a map on difficulty level Master.
Survive a map without using an active item or tower equipment.
Survive a map in 15 minutes or less.
Survive a map without building a tower that slows down or stuns monsters.
Skip a total of 10 minutes by calling waves in advance.
This achievement is hidden
Reach the global platinum rank.
Complete 100% of the game.