Anyone want help me with 3 co-op achievements?

Community Recruiting
1

I need 3 co-op achievements
On my mark: assassinate 2 elites on the same time.
Maverick: Team up on a vehicle to kill 30 enemies in Unconfirmed co-op.
Possibly doing this idk. Praying Mantis:

My GT: AsianPr0digy

2

Has anyone helped you with this yet? I will. Gamertag: Autom8ed