Looking through the Manaan achievements I see 0/250 Defeat Enemy Players

 

Nobody does these. In order to do them you pretty much have to organize groups on both factions to show up at the same time.

Are you in any large guilds? They do them.

Are you in any large guilds? They do them.

 

That's not the point.

Are you in any large guilds? They do them.

I am but these achievements should not be for "large guilds" only. They are a relic of the past from when there were PvP servers and you could PvP in the normal PvE instances. The current PvP instances are empty and hardly anyone uses them.

I don't know if it still happens but there were a few people that used to troll guilds/groups when they tried to run these events. That was the biggest issue when trying to do them.

We ran a server event for the 250 Manaan player kills on the Darth Malgus server on the launch week. There's another event that includes it on Sunday 28th: https://www.swtor.com/community/showthread.php?t=1008042.

 

I think unless a guild or group organises the player kill achievements as we do then it will takes years for some people to get the achievements due to how few people play on the PvP instances. I think the devs were trying out a new way to encourage people to play there when they added loot to dead players on Iokath but the implementation was a failure and caused the game to be unplayable:

My guildies used to line me up against the wall and then kill me repeatedly for achievements.

I'd be located right next to a spawn point / repair droid, they'd be of the opposite faction, and I'd just keep spawning over and over again right there.