Victor Vran

I've listed all Elite Challenges here, most of them are easy enough to work out if you've done any of the challenges up to this point. Challenges marked with a * have only the required numbers of enemies on the map. You can't mess these up.

For the bosses, I use what I call the "Dim Mak" - touch of death:

Ember talisman, preferably Holy Warriors (charge with positive effects) but Sorcerers works too (charge on demon power usage). At max level, Holy Warrior will charge with a single positive effect (Berserk).
Cavalier/Trooper Outfit to start with full Overdrive
Devastating+Cursed Hammer (3x Berserk / 1x Berserk+2x Dark Mist) of the Duelist (Armor Penetration) - should be able to find a Devastating/Duelist easy enough, just put Cursed on there as well and max all attributes.
A bunch of Death Cards
Activate Berserk and hit the boss with your talisman. Once.

The World of Wars
Overkill Monsters with Guitar (150)
Slay the Napalm Queen with 5 Hexes
*Slay Reapers with Demon Powers - They're all around the war zone area, they do not show up on the minimap until you get close.
Slay Champions without using Potions (10)
*Slay Firestorms while affected by Frailty without dying (2) - Middle Monument of Rock (near Napalm Queen), don't kill Blue Wraiths.

Bedeviled Vault
Slay Hellhounds With Ranged Attacks within 120 seconds (40)
Slay Forgotten Kings within 120 seconds without using Potions (5)
*Slay the Cleansing Ones with 4 active Hexes within 120 seconds (2) - Final Monument of Rock.
Slay Monsters with Guitar within 120 seconds with 4 active Hexes (100)
*Slay Hellhound Omegas with Demon Powers within 120 seconds (2)

The Furnace
Overkill Essences with 5 active Hexes (30)
Slay Succubi Firestarters while you are affected by Brutality (15)
Slay Monsters without dying and without using Potions and Demon Powers (50)
Slay Monsters within 180 seconds with 5 active Hexes (70)
*Slay Hellhound Alpha While Above 80% health without using Potions (1)

Wicked Garrison
Overkill Essences within 120 seconds (30)
Slay Murderlady with 5 active Hexes
*Slay Succubus Swordmaiden without dying and without using Potions (1)
*Slay Dark Knights While Above 50% health - One champion in secret area near start, 2 are the final bosses in the last Monument of Rock.
Slay Monsters without taking damage (40) - Way easier co-op. Have them clear the first room before joining the map.

Heart of Destruction
Slay Warpig Machine with Demon Powers within 120 seconds
Slay Warpig Machine with 5 active Hexes
Slay Warpig Machine While Above 50% health without using Potions
Slay Warpig Machine without using Potions with Hex of Malice
Slay Warpig Machine without taking damage with 3 active Hexes
- These are all easy enough to do with the Touch of Death setup, for the Demon Power however, damage him however you see fit then make the final blow with a demon power.

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The Weird West
Slay Undead Soldiers While Above 50% health without using Potions (20)
*Slay Scorpion Bashers affected by Brutality with Hex of Malice (10)
Slay Undead Fools while you are affected by Frailty (10) - Can get them at the Graveyard near Terminus Est, also Snake Fang's Spirit to the east. Don't kill the Wraith until you're done.
Slay Hellhound Alphas without dying with 5 active Hexes (2)
Slay Champions with 5 active Hexes (10)

Vanishing Wellspring
Slay Monsters affected by Brutality (50)
Slay Reapers within 120 seconds with Hex of Malice (3) - Just clear the first Monument of Rock.
*Slay Demon Spiders without dying with 5 active Hexes (2)
*Slay Scorpion Earthshaker within 60 seconds (1)
*Slay Demon Spiders without dying and without using Potions (2)

Dead Man's Mine
Overkill a dozen of Em' Cassidy Boys without dying (12)
*Slay Scorpion Champions with 5 active Hexes without dying - One is in a secret area near a Double Damage shrine at the checkpoint.
Slay Miner's Madness within 120 seconds with 5 active Hexes
Slay Succubus Swordmaiden Champions with Melee Attacks without dying (3) - These are found near the end of the map. Need to wait for them to be promoted to "Tyrants".
Slay Hellhound Alphas With Ranged Attacks without dying (3) - Hound Mistress at end will summon an Alpha or Omega when she draws a pentagram on the ground.

Windswept Canyon
Slay Scorpion Barragers without taking damage (10) - You really want to do this in co-op, its insane otherwise. Most of these are Champions.
Slay Scorpion Artilleries While Above 50% health (9)
Slay Champions With Ranged Attacks While Above 50% health (10)
Slay Treachery without using Potions while above 50% Health
Slay the Prejudiced Ones with 5 active Hexes within 180 seconds (6)

Terminus Est
Slay 50 Monsters with a single Attack or Demon Power - There feels like an enemy cap of about 55-60 on the map. Get this before damaging Orgasmatron too much else he brings out tougher skeletons.
Slay Orgasmatron with Hex of Tyranny
Slay Orgasmatron with 5 active Hexes
Slay Orgasmatron within 240 seconds with Hex of Tenacity
Slay Orgasmatron While Above 50% health with Hex of Malice
- You can get all 4 in the same attempt easily using Touch of Death setup.

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The Dark Ages
Slay Champions without dying with Hex of Malice (15) - Promoting Swordmaidens to Tyrants do not count towards this.
Slay the Bloodgreed spiders without using Potions (2) - South Monument of Rock.
Slay the Iron Lady without dying while she is affected by Brutality - Northern Monument of Rock.
Slay the Extorter while above 50% Health - Middle Monument of Rock.
Slay the Castellan with a Guitar with 5 active Hexes - Go to the Screaming Pathway, turn around and return to The Dark Ages and he's right there.

Frozen Hearth Cave
Slay Champions within 300 seconds (8)
Slay Spiders Spawned by Other Monsters with Hex of Time and Hex of Tyranny (30) - Spider Matrons spawn spiders at the Western Monument of Rock.
Slay the champion Corrupted Norns with Melee attacks with 5 Hexes (3) - Central Monument of Rock.
Slay Hlokk with Ranged attack with 5 Hexes without dying - Western Monument of Rock.
Slay Nidhogg with 5 Hexes without dying

The Slaughterhouse
Slay Monsters with Demon Powers While Above 50% health (50)
Slay Succubi without dying and without using Potions and Shrines (40)
Slay Andrey with 5 active Hexes without dying
Slay Lady Erzebeth without dying and without using Potions and Shrines - Monument of Rock.
Slay Soulfikar within 360 seconds with 5 active Hexes

Diseased Cellar
Slay Succubus Virtuosi with 5 active Hexes (2)
Slay Hellhounds Spawned by Other Monsters without dying (25)
Slay Succubus Witches with Melee Attacks (2) - South Monument of Rock
Slay Succubus Virtuosi While Above 50% health with Hex of Tyranny (2) - There is one at each Monument of Rock. The Northern one appears after the first wave, the Southern one appears at the end.
Slay the Abomination within 320 seconds with 5 active Hexes

Screaming Pathway
Slay Vampire Knights within 180 seconds without taking damage (3) - This one is real tough. Even with co-op you need to clear the way through to the Monument of Rock as the last Knights are there.
Slay Siena while above 50% Health without using Potions and Shrines
Slay Tyrant Succubus Swordmaidens with Hex of Malice (4) - Wait for them to promote.
Slay Zeal with Demon Powers without dying with Hex of Tyranny
Slay the Sisters of Mercy without using Potions with 5 active Hexes (2)

The Chalice
Slay Queen of the Damned with Hex of Tyranny
Slay Champions (25)
Slay Queen of the Damned within 360 seconds
Slay Queen of the Damned While Above 50% health
Slay Queen of the Damned without dying with 5 active Hexes
- Same as the others, use the Touch of Death setup above.