here is the full list of all 200 ingame quests that involves killing mobs (as objective rather then as means to an end [read: not looting poor drop rate crap but kill as objtice])

http://www.wowhead.com/?quests&filter=na=kill;ex=on

1) use the level range option to filter the ones that your team\alts can pick up
2) grab high level char
3) blast away!

=) did I help?