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