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