Necron Destroyers and Lychguards HELP!

[reeltalker2000]

The trophies "A Matter of Honour" and "Stopping Destruction" require destroying 10 Necron Lychguards, and 5 Necron Destroyers, respectively. However, trying to farm these trophies in Challenges - Stories - One Wolf Army is proving difficult. I have destroyed more than the desired quota. These trophies won't unlock. Do they have to be done in campaign missions or should I just grind in Challenges until they pop? Many thanks in advance.

[WARLOCK1972]

You can do it challenges or campaign:

 

Necron Lychguards are found in the 4th campaign - Mission 10. All squad member kills count towards this trophy.

You can farm these kills on One Wolf Army Challenge Story. There are two Lychguards located at the extraction point. Killing them is also an optional objective.

Necron Destroyers are found in various missions in the 4th campaign. All squad member kills count towards this trophy.

You can farm these kills on One Wolf Army Challenge Story. There is one destroyer located at the extraction point. Killing it is also an optional objective. Reconnaisssance in Force mission also has one destroyer as is also an optional objective: Defeat a Worthy Opponent