You must be on official servers for any of these to work. Sorry guys, no custom servers, it'll be quite the grind :'(

This one is pretty straightforward. Run around until you find a zombie and kill it with any sort of weapon. You could also, punch it to death with your bare hands.

There's a good chance you'll spawn with a food and/or drink item. Open your inventory, put the drink or food in your hand and eat/drink it. If for whatever reason you don't spawn with these, you'll definitely find food and water by exploring. If you must drink out of a river or pond feel free to do so.

This may take a bit of exploring. Melee weapons can be easily found in any building. Ensure you have it equipped on your back however once you find one. Firearms are mainly going to be found in houses, military bases and police stations. Like the melee weapon, ensure your firearm is equipped on your back as well. Backpacks, like the melee weapons, can be easily found in or near any building. If it makes it any easier, you could kill a zombie wearing one and equip their backpack.

Infected soldiers are just zombies in soldier uniform. These can usually be found near military bases and camps. All you'll need to do is kill it. Yes, you can use your fists.

Completing this will require a few items:
Firewood (obtained by cutting down a tree)
Rags (obtained by cutting up clothes or paper)
Matches or Hand Drill (obtained mainly in supermarkets or residential areas)
Long Stick (obtained by cutting down a bush)
Steak (obtained by killing a deer or buck)

Once you have gotten these items, you're going to hunt a deer or buck to obtain the steak. Create a fireplace by combining firewood and the rags. Light this up with the matches. Now, combine the long stick with the steak and proceed to roast the meat above the fire. After a full circle, the steak will change colour, indicating its cooked.

Killing twenty survivors or infected with a head-shot, pretty straightforward. It's all cumulative so you wouldn't have to do 20 head-shots exclusively on either one. You'll need to obtain a gun with ammo. As mentioned previously, you can find guns/ammo in houses, military bases and police stations. Once you've gotten your gun with ammo, kill 20 zombies with head-shots. You could kill actual players but be warned, they may attack back.

You will need a male character. Unfortunately, female survivors in game will not grow a beard. Next, you'll have to find a bladed weapon. Survive in game (I believe your beard starts to grow after an hour and a half) and you'll be able to shave your beard with the bladed weapon equipped in your hand.

You'll need to find a deer roaming within the forests. Deer in game make a loud mating call noise which is very audible. Once you find a deer or group of deer, shoot one of them to kill from a far distance (be careful not to get too close). Once you killed the deer, use any sort of bladed weapon on its body to gut the deer.

There are 3 parts to this (excluding the 3 campfires).
Creating a campfire: As mentioned earlier, this can be made by combining wood and rags.
Matchbox: These can usually be found in houses.
Flare: You will most definitely spawn in with this item, for whatever reason you don't, they can be found pretty much anywhere.
Hand Drill: Find a bush, cut it down with any sharp weapon. Once you get a long stick, use a knife on the stick to split it. Next, find some bark, which can be obtained on trees with a knife. Combine the split wood piece and the bark.

Use all 3 of these items to light up 3 different campfires.

Once again, this will be much easier to do with a friend. You will need to find either rope, duct tape or handcuffs. I highly recommend using rope for this as duct tape can be damaged after time and handcuffs require a handcuff key. Rope can be found mainly in supermarkets and residential areas. Once you've gotten rope (for your sake please don't use duct tape or handcuffs) meet up with your friend. Once you guys are together, equip the rope to your hands, look at your friend and start to tie them up. Once they're tied up, your friend will need to struggle out of the rope. Once they struggle out, the rope will drop to the floor, pick it up and repeat this process. You'll need to do this 10 times.

Boy oh boy this can be tricky. The easiest way possible is to hit up a friend to join the same server. You may be thinking, there is no map?!? How will I be able to find my friend?!? On the bottom of this guide I will provide information on an application that has all the DayZ "Official Maps". You guys will need to have an understanding of the maps and find a place to meet up. Once you guys find each other, have your friend stand far away (or you could use a rangefinder, but you don't really need this). Once you feel like your friend is far enough, shoot them.

As mentioned previously, its best to do this one with a friend (or if you're lucky, you can make a friend while playing the game that may help you out). Once you've met up with your friend(s), you guys must hurt each other (no, don't kill them just yet) until they bleed. Once they start bleeding, equip rags or bandages and heal your friend(s). Do this 30 times.

This can be obtained after time by playing the game but can easily be done with friends. All you'll have to do is kill 15 other survivors using a melee weapon (knife for example). Go up to any survivor or your friend and simply kill them with the melee weapon.

As mentioned in some of the achievements, it would be easier to do some with a friend. As there is no map you can look at on official servers, this application (iZurvive) provides you with every DayZ "Official Sever" map. It may take a while to get used to, but determining what map your server is on and learning your surroundings will become easier as time goes on.

If you don't have a mobile device or would rather look at the maps on your computer, you can head to: https://dayz.ginfo.gg/

Give yourself a pat on the back, you're finished! I hope this guide was helpful! If you have any questions or anything to say, please leave a comment down below :)