Use the same Jin spamming technique as mentioned before. As for Hard, go straight for Unlimited Tao. Don't let her die! You can spam her lethal half Hp attack with RT I think. Anyways, you could look at my achievement guide (Setsuna did most of the work though lol) as those are unfortunately only the best tips I can give.
OH, and make sure to abuse taunting. Gives you a free 100 heat per battle.
Alrite but I actually Watched a few vids of MikeZ playing tager on YouTube and was able to learn a bit of tagers combos and strategies. Made it to Unlimited Hazama the other day and it was epic fail on my end forgot to press start when I lost because I didn't drop a match up until that point.