The other 23 achievements are all boostable on the Multiplayer aspect of the game. All achievements apart from 1 can be boosted with 1 other player but will however take a long time. The majority of the achievements are getting 100 kills with blabla weapon however there are a few object related ones such as needing to kill the flag carrier 5 times in CTF and being the only person to capture a flag on your team. Your main objective though should always be to keep in mind that there is an achievement for getting 500 kills with American weapons and 500 kills with Japanese weapons. That's a total of 1000 kills your going to need to get online, 2000 if your boosting with a buddy. This takes time but the process can be done quicker if multiple people join your boosting session which I highly recommend otherwise you'll be boosting online for over 15 hours.
Final Verdict: - This game was listed as a game that can give you 1000 gamerscore in 10 hours on x360a's list therefore I rented it for a quick gamerscore boost. Although the game was quick it wasn't 10 hours quick, the multiplayer boosting alone took that amount of time. The boosting is not fun to do and becomes boring and tedious fast while the single player can be frustrating and difficult at times on Hard difficulty. I say stay as there's plenty of other better games to choose from however if it gets placed upon your hands as it did to me then it's worth giving it a go.
