This should come with a little effort, but just in case you'd like to do this quickly, here's the quickest 15 I found. I start with the easy ones, then at the end put forward a bit of grinding options should you need a few more. A very handy mission to replay is Mrs. Chu's Revenge, as it features melee enemies, armed melee, firearms, and driving.
OVERALL45 points in total stat award score: one point for bronze, two for silver, three for gold. This will come close to 15 silver, if you continue on and get golds. Given how easy some of the golds are, this one's almost a given.
SNIPERHave a 30% accuracy rate with your last 50 shots. Either go to a drug bust like Sun Yat Housing Complex in Kennedy Town, or load up Mrs. Chu's Revenge and play to the end of the level. When driving away, aim at the cars and wait for the slow motion; as long as you hit the car, it all counts.
HEADHUNTERScore 25 headshots. Any mission with a gun is good for these; The Wedding, The Funeral, and Mrs. Chu's Revenge are all good options.
NINJA5 instant takedowns from behind. Get the Leg Break move from the Jade Statue mission or the Surprise Attack move from the Triad upgrades. Use the combo on an enemy and it will leave them stunned with their back turned. Neither work on wrestlers, but only the Surprise Attack works on armed melee foes.
BONEBREAKER40 broken bones. The Leg Break move from the Jade Statue mission is invaluable here as well.
ENVIRONMENTALIST25 environmental kills. Whenever grappling an opponent, look for objects highlighted in red. Either press
near them or run them into it by holding
.
DEFENCE50 counters. This one's a given.
FAST TALKER5 successful fast talks. There are exactly five fast talk points in the campaign by the end of the mission Bride to Be. If not, replay Bride to Be and there will be three monks at the end to fast talk in rapid succession.
DEADEYE5 thrown weapon kills. Careful with this one, as if the thrown weapon hits you, it's an instant kill on yourself. Whenever you see a group of enemies while driving around, stop, find a car with a tire iron, and when they get close enough to fight, hold
to lock on, make sure you're looking in the right direction, then
to throw.
MARTIAL ARTIST50 melee kills. Load up Mrs. Chu's Revenge or go take on the martial arts clubs if you don't have this one.
ENFORCER100 total enemy kills. The Wedding has a lot of enemies, as does The Funeral and Mrs. Chu's Revenge.
SAFE DRIVER15 minutes total clean driving time. This one's very dependent on driving a car around instead of a motorcycle. Use the racing coupe from the Hotshot case and the time will rank up slowly but surely. If not, there's a circular road in the north of Central that you can easily drive around without hitting anything.
MOGULEarn $500,000. This won't be much of a problem between lockboxes and side mission payouts, especially Tran and Roland. Gambling also works.
PUBLIC ENEMY100 kills in a single play session. Silver or not, the best option here is to aim for the gold so you aren't coming back for it, which is 200 kills. Martial Arts Club, Mrs. Chu's Revenge, drug busts, do whatever you need to do to keep that kill counter rising.
From here, the achievement needs a little grinding. Which of the following you do depends on whichever one seems fun or has the closest progress.
FLUID STRIKER, DISARMS25 vault attacks, 25 disarms. Load up Mrs. Chu's Revenge, play through the melee sections, then get to the point where you need to vault over and into an enemy. This counts as both vault attacks and disarms. Restart checkpoint and you can do it as many times as you wish.
FIRESTARTER10 explosive kills. Payback is a good option for mission replays, as when you get the gun, several enemies are conveniently standing next to explosive barrels, highlighted in red. Restart checkpoints to farm these kills.
GUNMAN50 firearm kills. Replaying missions with guns if you want it quickly; The Wedding, The Funeral, and Mrs. Chu's Revenge should be more than enough.
HIJACKER10 action hijacks. Some of these are done in story mode, but a good way to build up five is to do the Kleptomaniac achievement for hijacking five security vans. From there, do a few more on random cars to boost it up.
GAMBLERSave outside the cockfight at the north end of Kennedy Town. Bet the maximum amount on either cock. If you're down $200k from when you last saved, load your save back up. If you win and you've made money, save again. This award tracks up and down, so if you continue to lose, you lose progress. This will also earn you the Infowlable achievement.