Powerstar Golf

I'd recommend waiting on this one until you have better gear. You want to be able to have some serious power before you tackle this. I did this with Frank, though you can use anyone you feel comfortable with as their abilities don't matter.

As it says, you need to simply complete any 18 hole round on the new course under par - so you want to choose Amateur and when asked to equip boosters skip on by.

Be careful not to activate any skills or abilities while you play - although I can say for sure that using a Golfer's ability and then turning it off again (Franks long drive for instance) before swinging does not disable the achievement. Since you can't undo a caddy skill, make sure you don't hold B at all.

I strongly suggest going for the par5 achievements first as they will get you acclimated to those holes. Once you learn them, it should be simple to eagle them when they come up. It should help compensate for any issues you have while playing. Remember, it just requires you to be under par. Take your time and plan your shots.

Your caddies are allowed to have perks though. I got the achievement despite my caddie having all three perks turned on. Just no boosters or power-ups from your golfer.