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