Space Hulk: Tactics

I got this playing the genestealers (Broodlord) campaign, on mission 8 - The Broodlord Is Awaken.

What I did was thin out the other Marines, notably the Sargeant with the servo skull, so that the 3 marines on the left (including the Librarian) can then be attacked from all 4 directions.

Just remember to save after every round (in case you mess up) and remember it has to be the Broodlord who kills the Librarian.

Good luck!!

This can be done in campaign (as other solutions mention) or can be boosted with another player in an online game (I'm guessing you can also get it in a skirmish mission against the AI, but I haven't tested it). I can also confirm that DeviSlator is right - the achievement pops when you attack the Librarian with a Broodlord, win or lose.

I did a regular online game while boosting the other multiplayer achievements. I used the default Genestealer squad (make sure it has a Broodlord, of course) while my partner used the default Terminator squad (make sure it has a Librarian). Then Terminators just places their Librarian in front, while Genestealer churns cards until they can make a Broodlord.

This may be glitched as it popped for me by merely attacking the Librarian with the Broodlord (Genestealers Campaign Level 8 - you're given a Broodlord to start with). My Broodlord got killed by the Librarian in combat but it still popped.

Make use of the save and load function to try different strategies to get close and get the kill (or defeat).

Please add your comments if the glitch worked for you or not.