Niffelheim

This is exactly as the description says. You’ll need to upgrade all your Defenses (Castle, Walls and Towers) to Level 8, all of your workstations (Sawmill, Forge, Kitchen and Alchemy) up to Level 5 and you'll also need to upgrade your two secondary buildings (Coop, Sheep Pen and/or Greenhouse) to Level 3. It's highly recommended that you do all of this before you go for the shards to reopen the Portal to Asgard (see Ascendant of Ragnar Lodbrok). This is because you want to make sure you have the best equipment and potions before going up against Hel for the last portal shard needed. Even though you're limited to 100 days for that trophy, you’ll be able to upgrade everything in under 50 days, leaving you plenty of time to work on collecting the Shards.

The breakdown of materials needed for each construction is as follows:

Castle:

1. (8) Board, (4) Rope
2. (9) Board, (4) Flammable Oil
3. (24) Straw, (16) Clay. (12) Board
4. (20) Clay, (12) Board, (10) Copper Ingot
5. (24) Clay, (16) Boards, (12) Copper Ingot
6. (32) Building Stone, (20) Boards, (16) Iron Ingot
7. (42) Building Stone, (20) Boards, (16) Silver Ingot
8. (64) Building Stone, (24) Boards, (16) Titanium Ingot

Walls:

1. (5) Board, (2) Rope
2. (6) Board, (2) Flammable Oil
3. (15) Straw, (10) Clay, (7) Board
4. (12) Clay, (7) Boards, (6) Copper Ingot
5. (15) Clay, (10) Board, (7) Copper Ingot
6. (20) Building Stone, (12) Boards, (10) Iron Ingot
7. (26) Building Stone, (12) Boards, (10) Silver Ingot
8. (40) Building Stone, (15) Boards, (10) Titanium Ingot

Towers:

1. (5) Board. (2) Rope
2. (6) Board, (2) Flammable Oil
3. (15) Straw, (10) Clay, (7) Board
4. (12) Clay, (7) Boards, (6) Copper Ingot
5. (15) Clay, (10) Board, (7) Copper Ingot
6. (20) Building Stone, (12) Boards, (10) Iron Ingot
7. (26) Building Stone, (12) Boards, (10) Silver Ingot
8. (40) Building Stone, (15) Boards, (10) Titanium Ingot

Sawmill:

• (5) Boards, (2) Rope
• (10) Boards, (2) Flammable Tar, (1) Copper Ingot
• (15) Boards, (2) Flammable Oil, (1) Titanium Ingot
• (20) Boards, (2) Vial of Pure Oil, (1) Golden Ingot

Forge:

1. (4) Building Stones, (4) Timber
2. (8) Building Stones, (6) Clay
3. (16) Building Stones, (2) Coal, (1) Iron Ingot
4. (32) Building Stones, (2) Gunpowder, (1) Titanium Ingot
5. (64) Building Stones, (2) Vial of Pure Oil, (1) Golden Ingot

Alchemy Station:

1. (3) Boards, (4) Building Stones
2. (5) Boards, (10) Straw
3. (10) Boards, (2) Bear Hide, (1) Iron Ingot
4. (15) Boards, (2) Magic Essence, (1) Titanium Ingot
5. (20) Boards, (2) Witch Skulls, (1) Golden Ingot

Kitchen:

1. (4) Timber, (8) Twigs
2. (5) Boards, (10) Clay
3. (10) Boards, (2) Boar Hide, (1) Coal
4. (15) Boards, (2) Flammable Tar, (1) Gunpowder
5. (20) Boards, (2) Vial of Pure Oil, (1) Silver Ingot

Secondary Constructions (Chicken Coop, Sheep Pen, Greenhouse - their tiers are all the same):

1. (10) Timber, (20) Twigs, (2) Rope
2. (15) Clay, (20) Straw, (4) Flammable Oil
3. (20) Building Stone, (10) Board, (10) Iron Ingot

You can have two of the same secondary constructions upgraded at the same time and the trophy will still unlock. It's recommended you start off with 1 Sheep Pen and 1 Chicken Coop so you can gather Wool and Feathers needed for the earlier upgrades. Once you don't need those materials anymore, switch to 2 Greenhouses so you can work towards Landowner. All of the constructions must be fully upgraded at the same time so just until you've moved on to the Greenhouses before working on the secondary-station upgrades since you'll be using [the Greenhouse] far longer than the other two.

Once you've upgraded all 11 constructions to the highest tier possible, the trophy will unlock.