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