Same issue:
Toon: Ironstrike
Server: Jedi Covenant
Faction: Imperial
Planet: Section X
Guild: You Ain't Sith
I did receive the conquest rewards, but no title or achievement. Contacted customer support multiple times & told our guild came in 3rd place in section x. I was on to the end & were 1 Mil ahead of the closest guild. So arguing back and forth getting nowhere with this (Multiple emails). Had the same problem on the account the beginning of June with the KOE guild (Chip Hazard). Still haven't received the Ilum conquest title or achievement as promised!