Batman: Arkham Origins
Shockwave them first, batarang, glue someone, gel on ground, then multi batarang, sonic batarang someone, batclaw someone, remote claw two together, remote claw if possible someone to a ledge, cape stun and then beatdown, cape stun and jump on someone (middle, space space), counter one person, counter two people (double click right button), use various combo attacks (E,R,T), and just plain attacking and crit hits.
You don't have to do them all in one free-flow attack and you can be hit.
But its not hard to get 50 with the 20+ peeps, as long as you have a crit chain going for a bit since each crit is 2 combo points.
If you are not so good at large crowds, use the trainer and have the combos always on option and keep pressing R when close, this will push them back, keep doing that after a couple of hits, it will keep your combo points and give you space to plan.
[Edited by DABhand, 10/31/2013 6:25:28 AM]
edit - never mind found it.
[Edited by imotep12, 11/2/2013 12:23:00 PM]
They hardly ever register, even when I build up a x40 combo...
I can't believe that they haven't picked up on it yet and remedied the situation.
Does anyone know of a trainer out there that accommodates the 20 Crit Strikes?
[Edited by gertrude26, 12/5/2013]