Some things to note:

• The medals and open battles achievements would be easier done after the campaign when you have everything unlocked.
  
• To get achievements out of a particular level you need to not use Thor's Favor.

You'll confidentally get these as you play through the campaign.

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The counting has started
Get 1 medal in the campaign.


Quite easy.

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Baby I'm a rich man
Get 35 medals in the campaign.


After finishing the campaign you'll likely have around 32+ medals as there's 30 levels and the last one is the credits which gives you 3 medals.

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Redbeard's adventure
Finish the campaign.


What it says on the tin.

You get these from doing certain things in, specifically, open battles, which are the ones with the skull icon in the map and lets you select which units you want to use.

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Shawarma delivery!
In an open battle, build a single Sand Witch and have her be near the enemy base when you defeat it.


One way you can do this is in the Open Battle Level 'Greasebeard', you'll need the Sand Witch, Goblin Spearthrower, Mirage spell, and a Siege Troll.
From the beginning immediately go for 3 workers and then send 1 Spearthrower out to do some damage, for now you'll want to get as much gold as you can so you can rush to research the Siege Troll and the Sand Witch, you should be able to send 1 Siege Troll out before the enemy can reach you, after which, you just need to spam Sand Witches out to help as he does most of the damage and you should get it. You can also do the Mirage spell to duplicate Witches, and optionally you can also pick and send the Master Chef to do some healing.
Remember that you can put the Troll in throwing stance to have him wait for the Witch, or better yet have him throw a witch to the enemy base so there's one constantly there waiting for you to destroy it.

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Who needs spells?
In an open battle, win without any spells in your upgrade menu.


The earliest you can do this is in Open Battle Level 'Policeman', you need the Siege Troll, Barrel Rider, Goblin Spearthrower, and the Portal.
Start by immediately collecting the nearest gold blocks and sending out the Siege Troll to the top path, after they've been collected and you see the Trolls shield touching the sign pointing up, immediately send 2 Barrel Riders and, after their cooldown is up, a spearman, all of them on the bottom path, after the spearman is through, put the sign pointing up again.
By this point you'll probably be able to destroy the enemy base quite quickly, but if you want to do the bonus objectives too, since I'm explaining it, you just need to build a portal on the top path from one end to the other, so that the worker can get to the enemy blocks faster, you just need to pick them up, not fully collect, and that'll be another objective, after that doing it this way will easily get this level completed under 4 minutes.

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Didn't bat an eye
In an open battle, have your Demon workers be participating in defeating an enemy base.


You can do this in Open Battle Level 'Skrit', you'll need the Siege Troll, Master Chef, Spearthrower, Call to Arms spell.
I start by getting 3 total workers and then researching and sending out a Spearthrower, then it's a matter of researching the Call to Arms spell and the Troll, I then as fast as I can send out the Troll before the enemy can reach me with his units, I also at this time research the Master Chef as soon as I can to spam those units out to come in and heal the Troll, as I ready and unready the workers so they stay near as we approach and eventually destroy the enemy base.

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All you can eat!
In an open battle, have your units eat 20 shawarma in a single match.


For this you'll need the Ball of Sheep/Polymorph, and Lightning spells.
To get Shawarma you need to kill a sheep with a lightning spell, sheep from the ball can be 1 shot, sheep from Polymorph needs 2 shots. Shawarma will stay on the field for 30 seconds only, and a bundle of 3 Shawarma spawn at a time. You should only need at minimum 3 Balls of Sheep, but it all depends on what strategy you use.

You get these from bonus levels.

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Ol'Larry's Rampage
Get over 50.000 points in Ol' Larry's Rampage.


This will take some practice to be able to hit enough enemies to combo, it doesn't matter if you hit 1 or 2 sheep, as long as you get a large enough group of enemies that you can juggle a bunch.
If you're good enough you can get 30k to 40k points in the first run and then get the remaining points in the 2nd.
Remember you only need 10k points to be able to get another run, there's no limit to the number of runs either, but 2 should suffice.

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Ragnarockin'
Get over 200.000 points in Ragnarockin'.


You're just gonna need to get skilled in this.
Some tips for this are:

• You can shoot the Statue Nagas without losing the multiplier
  
• The best way to go about this may be to play it slow and let enemies group up so that you can constantly shoot and always have some enemies on low enough health that you don't lose any points by shooting.
  
• The Necromancer is good for this as his skeletons can be 1 shot and they keep respawning for some free 1k points every time, which is also great because you need to slowly whittle down the necromancer's health.

Other notable info is:

• Max multiplier is 10
  
• Spearthrowers take 1 shot to die.
  
• Goblin Warriors take 2 shots to die.
  
• Barrel Riders take 1 shot to die.
  
• Siege Trolls take 9 shots to die.
  
• Nagas take 3 shots to die, another 3 for the statue.
  
• Necromancers take 4 shots to die.
  
• Skeletons take 1 shot to die.
  
• You will lose points with every shot taken, you only gain points by killing enemies in which case you won't lose the points of the shot used that killed enemies.

Eventually Siege Trolls will start throwing enemies to the middle, at this point you might panic, but if you've done good enough, by this point you should already have more than 200k points for the achievement and can panic in peace.

There's only the 1 achievement that didn't fit in any other section, so I put it here.

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Genie, I wish you free!
Get 90 medals in the campaign.


I'd consider this one one the harder achievements to get, not much I can say here. You got this though.

Unfortunately there are achievements that you have to do online.

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Miss Chievous
Finish 1 online match.


You just gotta do 1 online match.

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Start a party!
Invite a friend to a match, and have them join.


Self-explanatory.

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King of the world
Win 100 online matches.


It'll take a while but you got this. Also according to Pachinko Master in the King of the world Achievement guide, only quick matches count, not when inviting a friend.