Hold your own consists of two teams. Your goal is to capture the other teams gold and win overall. For this achievement you need to let the other team win by two captures. Then once they hit two you will need to win the game by exceeding their captures and win the match. The only way you will be able to do this without struggling online is gain experience in the game it's self and the maps you play on. If you have a good team and can overpower the other team with little effort you shouldn't have an issue with this.
If you are having trouble earning these achievements without getting frustrated, you can setup a boosting match with a few friends. Head into a public freeroam and meet up at a town of your choice. Make sure the freeroam is rather empty, as other players just tend to interfere. Have everyone meet at the marker of choice, now make sure everyone presses roughly at the same time. You will now all be taken into the same game mode and lobby. You can now setup different game matches by skipping through the playlists by press to skip or to start a match.
Just skip through the various matches until you find the mode you want. Once you join the game work out which achievements you're working towards, if other players join you can vote to kick them if they become an issue.