To get applications in the co-op, you complete levels. Here's a list of the relevant ones: (please help me fill it in) If you complete each mission once, you will have all of them.
Heal/ prevent
Shielding (unlocked at start)
Squad heal--Mercenary camp, Western Europe
E-drain--Unlocked for completing a mission.
C2C Pulse--Unlocked for completing a mission
Damage
E-drain--Unlocked for completing a mission.
Backfire--may require upgrades, unlock unknown.
Virus--Unlocked for completing a mission.
Damage Link-- Unlock unknown.
The basic heal may also count for this. The achievement appears to track overdamage and overhealing, so using Squad heal with everyone at full health should count. I got this playing normally with Shielding and E-drain. Equip those two and use them as often as possible.