IN-DEPTH MINI-GUIDE FOR EXTREME VARIETY:
First of all, credit goes where due to the great boosters I got this with. They are as follows:
A7X Sephiroth, reverse6977, Comander Drizzle, Empire of Maury, Stomper001, TachyonicRage.
Now, the other posted guide (by CTDMUDRUNNER) is very good for telling you what to do to get the individual bonuses, and on the whole they are not that bad, but some - especially Extreme Variety - are a real annoyance. So, after a few hours, I worked out a good general order to get it. We got 5 people in a row Extreme Variety by doing this.
We also found that the co-op bonuses did not seem to count, and neither did Variety and Greater Variety. If someone discovers evidence to the contrary, please let me know. Also if anyone finds any errors, please tell me - this is my first pseudo-guide!
Alliance Private Match (Easiest for us, you may change as desired) Team 1 contains person wanting Extreme Variety, Team 2 are their targets and Team 3 are their hunters.
The Person Going for Extreme Variety (with Hidden Gun and Poison Equipped):
1: FIRST BLOOD (just go up to target and kill).
2: Usually gets SILENT along with above. If not, swap #3 with here or insert later on, etc.
3: Do some running around before next kill to get DISCREET.
4: Jump in bush, etc. (without being seen by target), and kill with full focus bar to get INCOGNITO, FOCUS, HIDDEN.
5: See Above (FOCUS).
\-> VARIETY should pop.
6: See Above (HIDDEN).
7: Hang from a ledge, have target hang beside you and kill to get ACROBATIC.
8: Same as above, but have them stand above you on ledge to get DROP KILL.
9: Have a member of Team 3 (not your targets), stun a target then kill them on the ground for GROUNDED.
10: Kill with poison for POISON.
\-> GREATER VARIETY should pop.
11: Have someone climb up high onto a ledge, lock onto them with the gun (but don't release RB/LB), let them jump then shoot them in the air for MID-AIR. (This usually concludes Round 1).
12: Poison your target, then have your teammate kill them quickly for INTERCEPTED.
13: Stun a member of Team 3 for STUN.
14: Move close to a civilian that looks like you and have a member of Team 3 kill them for LURE.
15. Have a member of Team 3 run around near you to trigger an escape and then run and hide to get ESCAPE.
\-> EXTREME VARIETY should pop.
We usually had ~2:00 left on the clock in round 2, which can then be used to boost some miscellaneous bonuses people may need.
Note: There are substitutions, for example one can often get SAVIOUR while doing the bush kills if everybody is nearby. Also, DOUBLE ESCAPE can be obtained if both members of Team 3 start a chase, etc. One could also get AERIAL KILL (even though its not on the bonus list for some reason). Thus there are more than 15 allowing for some variance. There are other alternate choices as well. This is just how we did it while avoiding co-op bonuses, which caused us no end of trouble.
There are good spots in each level to do this with all the requirements. We used:
Monteriggioni - Up near mansion.
Rome - Under Pantheon pillars after others killed the NPC's.
Florence - On rooftop around central pillar.
Forli - Around large well in bottom corner (we skipped it - annoying map with a lot of NPC's).
San Donato - On rooftop of central building with bell tower.
Castel Gandolfo - On front fountain.
Venice - On top of blue stall in central pavilion.
Siena - On top of yellow/orange tent with bar inside.
Of the above, San Donato and Castel Gandolfo were the easiest, so if you are doing a private match, I recommend those maps.
Hope this helped (this bonus was very annoying - have fun doing it legit lol).