Here is the full list of all 62 Warhammer Underworlds: Online achievements.
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Win 20 Games as Steelheart's Champions
Win 20 Games as Magore's Fiends
Win 20 Games as Sepulchral Guard
Win 20 Games as Ironskull's Boyz
Win 20 Games as The Farstriders
Win 20 Games as Spiteclaw's Swarm
Win 20 Games as Thorns of the Briar Queen
Win 20 Games as Stormsire's Cursebreakers
Win 20 Games as Eyes of the Nine
Win 20 Games as Chosen Axes
Win 20 Games as Storm of Celestus
Win 20 Games as Drepur's Wraithcreepers
Win 20 Games as Garrek's Reavers
Inspire Severin 15 times
Inflict 40 wounds with Magore
Return 15 fighters with The Warden
Kill 15 fighters with Gurzag
Inspire Sanson 15 times
Charge 20 times with Scritch
Make 30 attacks with The Briar Queen
Cast 30 Spells with Stormsire
Summon the Blue Horror 15 times with Vortemis
Inflict 40 wounds with Fjul
Inspire Drakan 15 times
Kill 15 fighters with Viceroy Drepur
Make 30 attacks with Garrek
Score Annihilation in a Casual or Ranked Match
Score Annihilation in a friend match
Damage 10 fighters at once with Shardgale
Kill a fighter with Reflected Injury
Kill a fighter with Encroaching Shadow
Kill a fighter with Entropic Curse
Heal 20 fighters with Tainted Vitality
Score Accept Inevitability in a Casual or Ranked Match
Score Accept Inevitability in a friend match
Heal 10 wounds with Vampiric Weapon
Break 5 Shadeglass Spears
Break 5 Shadeglass Daggers
Score Assassinate 10 times
Deal 5 damage in single attack
Deal 7 damage in a single attack
Earn glory from Sacrificial Pawn
Steal 5 glory with Daylight Robbery
Score 10 glory using keys
Kill 20 fighters in Casual or Ranked
Kill 50 fighters in Casual or Ranked
Kill 100 fighters in Casual or Ranked
Inflict 50 wounds in Casual or Ranked
Inflict 200 wounds in Casual or Ranked
Inflict 500 wounds in Casual or Ranked
Earn 40 Glory in Casual or Ranked
Earn 100 Glory in Casual or Ranked
Earn 500 Glory in Casual or Ranked
Score 25 Objectives in Casual or Ranked
Score 75 Objectives in Casual or Ranked
Score 200 Objectives in Casual or Ranked
Roll 1 crit in an attack or defense roll
Roll 2 crits in an attack or defense roll
Roll 3 crits in an attack or defense roll
Win 20 Games as Mollog's Mob
Kill 30 fighters with Mollog