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