Here is the full list of all 67 Warhammer 40,000 : Eternal Crusade achievements.
Complete a hard lair mission as a Ranged Archetype
Complete a hard lair mission as a Support Archetype
Complete a lair mission with only Heavy Archetypes in your team
Complete a lair mission with only Melee Archetypes in your team
Reach Rank 5 with any character
Complete any lair mission as a Melee Archetype
Complete a lair mission with only Jump Archetypes in your team
Complete a hard lair mission as a Jump Archetype
Complete a hard lair mission as an Melee Archetype
Kill 10 Warriors
Complete a hard lair mission as a Heavy Archetype
Complete a lair mission with only Ranged Archetypes in your team
Complete a lair mission with only Support Archetypes in your team
Kill 10 Tyranids in a single Multikill
Collect all commendations as an Ork
Successfully attack Agnathio
Successfully defend Agnathio
Collect all commendations as a Space Marine
Collect all commendations as a Chaos Space Marine
Reach Rank 5 as a Space Marine
Reach Rank 5 as a Chaos Space Marine
Master all core Ork weapons
Reach Rank 5 as an Ork
Reach Rank 5 as an Eldar
Kill 100 Termagants
Collect all commendations as an Eldar
Earn 5000 XP in a single match for each of the five basic Ork classes (XP must be earned on foot)
Successfully attack Medusa Relay
Earn 5000 XP in a single match for each of the seven basic Eldar classes (XP must be earned on foot)
Kill 1000 Hormagaunts
Successfully attack Zedek
Successfully defend Zedek
Successfully defend Medusa Relay
Master all core Space Marine weapons
Master all core Chaos Space Marine weapons
Master all core Eldar weapons
Win a battle with a War Party you created
Earn 5000 XP in a single match for each of the five basic Chaos Space Marine classes (XP must be earned on foot)
Reach Rank 4 as any faction
Earn 5000 XP in a single match for each of the five basic Space Marine classes (XP must be earned on foot)
Complete any lair mission as a Ranged Archetype
Complete any lair mission as a Jump Archetype
Complete a mission in under 10 minutes
Complete any lair mission as a Heavy Archetype
Kill a Tyranid Warrior using only personal weapons (Knife or Knuckles)
Complete any lair mission as a Support Archetype
Successfully defend Maggon Station
Successfully attack Maggon Station
Reach Rank 3 as any faction
Spend 10 AP on Advancements
Successfully defend or conquer a Fortress
Successfully defend Imperial Fortress Harkus
Successfully attack Imperial Fortress Harkus
Successfully attack Olipsis Refinery
Successfully defend Olipsis Refinery
Successfully defend Torias
Successfully attack Torias
Successfully attack Blackbolt Defense Station
Successfully defend Pegasus Station
Successfully defend Blackbolt Defense Station
Successfully attack Pegasus Station
Down a Jump Pack character with a melta bomb
Killed one of the game's developers
Won 10 matches
Played at least 20 hours
Reach Rank 2 as any faction
Complete one match