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