Plants vs. Zombies: Battle for Neighborville

Easy to do split screen:
Load up giddy park with ai.
Make acorn your second controller and the sunflower as your main account.
Place the acorn in the centre of the map near the stairs on the left, as the tv screen zombies regularly run down them. Let them kill the acorn, revive with your sunflower. Press X to revive and hit LB to heal yourself while reviving so you don't go down yourself.
Repeat 10 times and achievement is yours.
Took me less than 10 minutes

This achievement can be earned by reviving a total of 10 bots playing as playable characters or players by pressing and holding near them when they get vanquished. In some cases, allies cannot be revived.

There are two ways you can earn this achievement:

1. Play PvP/Ops with bots/players using the portal, and try to camp in a hidden space, only coming out to revive a downed ally. (unless you're as good as me , DO NOT run around like an idiot exposing yourself to danger because, believe me, there are a TON of cheaters and pros out there waiting to kill you!) You should get this achievement after a short while.

2. If you have a second controller, join a private Giddy Park server and let player 2 die from wildflower/TV head attacks then revive them. Repeat this 9 more times and BOOM, achievement.

Cheers

This can be achieved in any of Bingo Bongo's Battle chest challenges! You can follow your teammates around or keep an eye out for the downed marker!