Need help getting the Pension Plan Achievement in Halo: Spartan ****

Need help getting the Pension Plan Achievement in Halo: Spartan ****. The Achievement says (Earn 25000 XP throughout your career.) But any tips on how to get 25000 XP throughout career mode?

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Need help getting the Distinguished Service Achievement in Halo: Spartan ****

Need help getting the Distinguished Service Achievement in Halo: Spartan ****. The Achievement says (Earn all medals in the campaign at least once.) But any tips on how to get all of the medals in career mode?

 

Halo Spartan **** Not Working

I purchased halo spartan **** on my xbox one and come to find out the achievements from spartan **** that are supposed to unlock halo 4 content don't because the achievement is labeled under xbox one games and not spartan ****. I tried looking for 343 industries
contact information and there was no available contact info so I turned here. I bought spartan **** for the halo 4 unlocks so I'm very disappointed. (If you don't know what I mean about unlockables Google halo 4 spartan **** codes) Thank you for your time
and help