Overachiever

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Earn all co-op medals at least once

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There are fourteen different Co-Op medals that must be earned for this achievement. Again, unlike the Single Player medals, these require a mix of coordination and communication to pull off. Below, you can find a list of all the required medals:

Killpower: Kill 20 enemies within 3 seconds of each other.
Killociraptor: Kill 30 enemies within 3 seconds of each other.
Killdiculous: Kill 40 enemies within 3 seconds of each other.
Killowhat?!: Kill 50 enemies within 3 seconds of each other.
Invincible: Kill 30 enemies in a row without being hit.
Inconceivable: Kill 40 enemies in a row without being hit.
Unfrigginbelievable: Kill 50 enemies in a row without being hit.
Repellent: Prevent infection until your partner gets infected.
Kill it with fire: Kill 50 enemies with fire without being hit.
Medic: Heal your partner with a Regeneration Field.
Brick Wall: Block 10 Explosion or Infection Forms with your Hardlight Shield before it depletes.
Long Distance: Teleport back to your partner over a distance of 75 meters.
Bug Off: Use the Overshield to prevent infection.
Perimeter: Use Repel as a safe zone for your partner.
With this in mind, the first seven medals should be quite easy on the second mission, since there are energy barriers that block the Flood from storming into the central area in which you spawn. You can easily camp behind these barriers and keep shooting the spawning Flood to easily get your Killowhat?! and Unfrigginbelievable medals. Likewise, the Kill it with Fire medal can also be obtained on the second mission, using the same strategy mentioned above. Repellent, Medic, Bug Off, and Perimeter should all come naturally as you play through all five missions. Lastly, Brick Wall is best done on the fourth of fifth mission. Simply activate a Hardlight Shield once you pick it up, and deflect ten Flood spores with the shield in a row. For Long Distance, attempt this on the third mission. Once you get to the end of the bridge, have your partner run back to the start, and once they are close, teleport to them to achieve a 75+ meter teleport distance.