Tribes of Midgard

Death metal jays guide works perfectly fine with the buying and using the soul pots. Just want to add an alternative way to gain souls faster then with the runes he mentions. You do have to have progressed up to Fenrir in survival first though.

Once you've killed Fenrir, you can craft a station called Sindri's Foundry from Eira (the Viking at the spawn) that lets you sell items for souls. Combining this with a level 3 construction bench, you can craft blue rarity building materials and sell them for souls. You can essentially spend 100 wood to craft 100 blue floor panels and sell them to the foundry for 60 souls each (6000 total).

The amount of wood collected can be sped up by higher tier axe and the blessing bountiful grasps which doubles recourses from harvesting.

Later in game, once you have a tier 5 wood axe and this blessing to receive double resources, you can mine 1000 wood in well under 10 min, which gets you 60,000 souls. You only need shy of 290,000 souls so it will take less then an hour of grinding to get enough souls to finish it with the soul pots.
You could grind the full achievement out in only a few hours if you are able to do this.

Also want to make mention of a bug that happened to me and my mate when playing.
I had 300,000 souls left and wanted to spend them all at once so I tried to buy maps for 1000 each. I did this and was met with the in game message, 'Inventory full'. So after trying to go back to soul pots, I could no longer buy them as the inventory full message kept popping up. This pretty much bricked my world as I couldn't buy anything from the merchants.
Turns out when I tried buying the maps, the souls were spent but the number didn't change. So I essentially have 0 souls displaying 300,000. Took me a while to realise this and there was nothing online about it.

There doesnt seem to be a fix for the wrong number showing but just know when it says inventory full, you are out of souls, so whatever number your souls display is essentially your new zero

I hope that helps someone cause I was close to just starting a new world.

Hello achievement hunters

This one might seem like a massive task but fear not.. its easier than it seems as you will need around 350k-400k souls, you will need a few things before you start this.

Firstly this will be done in survival mode.

Runes.
5-6 Soul Mate runes (2 souls for every hit but 4 lost for every hit taken) these can be purchased from a sorcerer for 5000 souls each, you will have to find the one who sells them)

Skills
Hasty Impulse I: Increase attack speed by 10%
Hasty Impulse II: Increase attack speed by 20%
Týr's Double Hit: Trigger a 2nd attack every 2 combo attacks
Thrúðr's Wrath: Allows you to build Wrath. Wrath increases your attack speed.

Once you have these runes and skills you want to get a couple of low damage weapons (i went with axes as they hit quicker) go to one of the 4 Jötunn and go to town on them. Learn their attacks and dodge when needed. these will be lengthy battles, you will get tens of thousands of souls for each one killed. (you get the most from Angrboða as she summons a lot of minions)

Here is the magical part.. go to one of the sorcerer's and spend your souls on soul potions for 700 each, you can only hold a few at a time so you will have to drink the potions to regain 500 souls back, rinse and repeat buying and drinking till you get your achievement.

Happy hunting.