Use the Resource Reinforcement Special Weapon (Professor Briel).
Build 100 Inferno towers.
Using only Inferno towers, Win any Chapter 4 (or later) mission.
Win a chapter 4 (or later) mission with level 3 towers only and no selling.
Build 100 Cannon towers.
Enable a Tower Augmentation item on any tower.
Build 100 Boost towers.
Using only Gun towers, Win any chapter 4 (or later) mission.
Kill 10,000 aliens.
Using only Cannon towers, Win any Chapter 4 (or later) mission.
Use the Precision Targeting Special Weapon (Rear Admiral Phillips).
Survive 100 waves on any Super Grinder challenge mode.
Build 100 Gun towers.
Use the Temporal Cannon Special Weapon (Colonel Rissler).
Build at least 1 of each tower type in any single mission.
Build 50 towers of any type in one mission.
Build and fully upgrade each tower type in one mission.
Build every tower and every upgrade for each tower.
Survive 100 waves on Grinder challenge mode on any mission.
Beat a Chapter 4 mission or higher with zero cores captured.
Win a mission with at least 10,000 resources remaining.
Win a mission with at least 5,000 resources remaining.
Kill an alien boss creature. (Juggernaut, Rumbler, Turtle, or Crasher)
Use the reload checkpoint option five times in a single mission.
Finish all the missions in Chapter 1 in Story Mode.
Inspect 10 aliens.
Kill 1000 aliens.
Use the speed up control at 3x for a total of 60 seconds in any mission.
Build 20 towers of any type in one mission.
Use the Reload Checkpoint option.
Kill 100 aliens.
Sell 10 towers or more in a single mission.
Sell 10 towers.
Upgrade a level 1 tower to a level 2 tower.
Use the Orbital Laser Special Weapon (General Cai).
Earn a silver (or better) medal.
Kill 1 alien.
Earn a Gold Medal.
Recover a loose core.
Kill an alien carrying a power core.
Win any mission without selling any towers.
Win a mission with at least 1,000 resources remaining.
Earn a Bronze (or better) medal in a Single Player Mission.
Save a core that is less than 10 seconds away from the map's exit point.
Earn a gold medal on every mission in Story mode.
Earn a Gold medal in a Coordinated Defense Multiplayer Mission.
Use the Core Teleport special weapon (Professor Taylor).
Build 100 Meteor towers.
Build 100 Concussion towers.
Build 100 Tesla towers.
Use the command shuttle to move 6 map sections in Mission 6.
Earn 100 Gold Medals on any missions.
Using only level 1 towers, Win any Chapter 4 (or later) mission.
Build 100 Temporal towers.
Build 100 Laser towers.
Earn a silver medal (or better) on all missions in the Story mode.
Use the Tower Overcharge Special Weapon (Advisor Zacara).
Complete the single player campaign in Story Mode.
Enable a Tower Augmentation Item on 10 Towers.
Build 100 Missile towers.
Win a Gold medal on Mission 19 without using the Command Shuttle.
Play a DG Fighter Multiplayer mission.
Earn a Victory in a DG FighterMultiplayer mission.
Kill 50,000 aliens.
Earn a Bronze (or better) medal in a Coordinated Defense Multiplayer mission.
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