You can find adrenaline near where most medical supplies spawn. Sometimes they are randomly spread through the levels or inside the saferoom.
Once you have found an adrenaline shot hold onto it until one of the other survivors needs help. Press to equip the adrenaline and press to use it. Once you are under the effects of adrenaline hold down near the survivor that needs help.
Repeat this 10 times for the achievement to unlock.
Level: Dead Center Atrium
Players: 2 (two controllers/players)
Once you load the level pick up the adrenaline/defibrillator depending on the achievement you want to do. Kill the AI as they may cause you to miss out on reviving your team mate. Take the second controller or other player and throw them off the higher level of the mall complex. Run over to them and revive/defibrillate them. Once you have done this press and restart the round. Repeat this until you have both achievements.