Here is the full list of all 65 Warhammer 40,000: Rogue Trader achievements.
You stepped willingly into sewage on Footfall.
Playing on Daring, you did not let the Chaos Spawn consume any cultists at the end of the Prologue.
You tried to reach the Imperium.
You raised your own abomination.
You finished the game.
You became a Votary (Iconoclast) on Daring difficulty or above.
You completed the game on Daring difficulty or above.
You swore allegiance to the C'Tan.
You visited all the systems in the Koronus Expanse.
You destroyed at least one ship of every enemy fleet (pirates, Chaos, Asuryani, Drukhari, Necrons).
You learned the Necron language.
You completed Chapter 4.
You killed a defiler without destroying any of the 4 plasma batteries strengthening it.
You wore the Halo Device.
You found a gold xeno-idol.
You found your true love.
You completed the highest-tier colony project on each of your colonies.
You completed a colony project of the highest tier.
You completed Jae's second quest without being spotted.
You discovered the truth about Nomos.
You handed over Idira, Yrliet, and Marazhai to the Inquisition.
You completed Chapter 3.
You gained a third-tier doctrine.
You killed an enemy with 100 damage dealt by one attack.
You returned the boots in Chapter 3.
You completed Chapter 2.
You melted the ice planet.
You secured Dargonus.
You drove Marazhai mad at the governor's camp.
You reclaimed all the colonies of the von Valancius dynasty.
You decided the fate of Kiava Gamma.
You won all void combats.
You visited half of the optional locations.
You resolved the crisis on Janus.
You charted a new path through the warp from one system to another.
You gave the inheritance to the girl at the old pirate's funeral.
You won your first void combat.
You restarted the shields on your flagship and received no damage to the hull while doing so.
You completed Chapter 1.
You gained a second-tier doctrine.
Playing on Daring, you did not let any shuttles be destroyed at the end of Chapter 1.
You started a romance.
You killed the Daemon of Tzeentch in the sewers under the Upperway.
You completed the Prologue.
You became a Votary (Dogmatic) on Daring difficulty or above.
You became a Votary (Heretical) on Daring difficulty or above.
You dodged 500 enemy attacks with your party members.
You performed 500 critical hits with your party members.
You killed 5 enemies with one attack.
You destroyed 30 torpedoes.
You completed 20 orders.
You scanned all worlds and reported them to the Explorators.
You visited all optional locations.
You solved all the puzzles at the unidentified ruins.
You prevented 10 combats through dialogue.
You let the Khymerae tear apart all the gladiators in the first battle in the Commorragh arena.
You removed all debuffs from the Rogue Trader before meeting Malice.
You recruited a secret companion.
You discovered the truth about Theodora's death.
You investigated the secret bunker in the distress signal zone.
You surrendered Eufrates II to Chaos.
You subdued the Pit.
You obtained Sweet Perdition.
You queued patiently with the commoners in Jae's second quest.
You completed the game with any Conviction: Zealot on Daring difficulty or above.