Trophies - Successfully complete one of the following tasks to get a trophy:

Novice Defender (Bronze): Clear wave 10 on any single map.
Seasoned Defender (Bronze): Clear wave 20 on any single map.
Expert Defender (Bronze): Clear all the waves on any single map.
W1 Defender (Bronze): Clear all the maps in W1.
W2 Defender (Bronze): Clear all the maps in W2.
W3 Defender (Bronze): Clear all the maps in W3.
Crystal Hoarder (Bronze): Clear a single map without losing any crystals.
Champion Defender (Bronze): Clear all 12 maps.
Veteran Strategist (Silver): Accumulate a total score of 50,000 points.
Overachiever (Silver): Clear a map with more than 10,000 points.
Four-Star Strategist (Silver): Accumulate a total score of 100,000 points.
Good Samaritan (Gold): Clear a map without deploying a Thief or losing a single crystal.