Catch your first fish

Rescue all villagers (Greg, Bodger, Fred, Eugene)

Catch Snake fish (Can be obtain before its requested)

Discover way inside Undead Mines

Find a way inside volcano

Defeat ocean graveyard boss

Discover a way into shadow realm

Finnish main story

Pull a fish out of the water with a single pull!

For this achievement you need to catch a wish by a single pull/spell.
One you obtain dragon slash spell, head to the area where you can find a Honeywood herring, use that spell on it and achievement is yours

C'mon, how can you lose a battle against a herring?!
Now you might be wondering, how to fail a catch a fish that doesn't fight back?
Easy, we wait until it does.

For this achievement you need to fail to catch a weakest fish in game, to do this, you need to first hook one Honeywood Herring, and then wait 5-10 minutes until it finally start to fight back (for me it took 8 minutes)

Can be done at any point of the game, even at the very beginning.

This achievement can also be obtain by using ring of Dormor, (Requires legendary DLC) thank you Nika for mentioning this, and ring of negative life-regen, thank you *stylR for mentioning this.

Cure yourself during a fight.

Some of the fishing have special attacks, like stun or defense. What we are looking for is bleeding effect. Ones fish hits you with bleeding, eat a mushroom to cure it and gain achievement.

Mushrooms can be for Honeywood forrest.

You've filled all your pockets with fish! Hu ha!
Very simple, fill your inventory inventory with fish.

Parry a special attack from a Boss.
When facing against boss, you need to parry one of hes special attacks. Have to be a golden parry, normal wan't count. Also can't be done with some of the bosses as they don't use special attacks, only buffs that can't be parry. So like tentacle monsters anchor attack can't be parry.

Use spells, food and potions to become as powerful as can be!
For this achievement you need to one boots item from each category (a potion, food item and spell)
Thanks to TheGreenGobblr from this bit of knowledge. In my case, i use str, stoneskin, stamina potion, cheese and rage spell to get it.

After mastering every fishing technique, no fish stands a chance!
This one requires you to learn every single spell there is in game, this also means you need to fish at least one of every single fish, then visit Statue of Thidon. There is total on 60 different fish. You can also track your progress from the statue.

The town of Honeywood shines in new splendor. After woodcutter join with good people of Honeywood, he offers hes services to fix town (for a price and materials). You gain this achievement after every building reach lvl 2, except Fred house.

Now Honeywood could almost rival Alderkeep!
and you gain this one after fully upgrading every building. (except Fred)

The Mayor's most important employee! Or puppet? It's hard to tell the difference.
Mayor offers you a series of quest that requires you to collect all kinds of fish and bait to either satisfied hes needs or someone else. You gain this achievement to finish every single one of them ( I think there is 15 of them, one for each mayor house upgrade, requires confirmation)

While lvl 40 is maximum, you only need to reach lvl 35 to this achievement. Happens naturally when fishing. (Depending on luck of course) BavarianDragon and Cairn for this information

The finest collection of fishing gear in all of Honeywood, hu ha! Obtain every single fishing pole in game. There is total on 18 rods to collect ( Total is 21, but legendary rods are not counted and you start as one.) To get this you need to upgrade Bodger's shop to its highest an buy all 12 rods. This leaves 3 to find and 5 to obtain though the game. (needs double checking)

Can be found right side of the lake, very near the surface.

In the same cavern as the stones resources are

Gifted by the mayor after few quest.

To get this, head over right side of entrance where the iron ore is, and go all the way to the right then down. There is a drilling spot, and through that you can find a chest.

This can be found temple area on shadow realm, right above the final boss area. There is a drilling spot, and right though that a chest.

Reward after getting Bodger's hammer back 10 times

A hat for every occasion!
Just like previous one, to get this you need to find/buy every single hat in game. There is total of 15 hats. (18 in total but Legendary items are not counted and you start with one). 12 of these can be purchase from Eugene (requires highest shop lvl). This leaves two to find and one to obtain.

Hug the left wall until you see glowing weed and enter cavern with high current. Chest and crown can be found at the end of it.

Final reward from Mayor

Go all the way left, hop on another ship and throw you magnet. Hat is just edge of the map.

You have more rings than fingers!
Just like two previous one, this require you to obtain/buy every single ring in the game. There is 12 rings in game (14 in total but legendary items don't count). You need to buy 6 of these from Willow (requires max shop lvl), 3 can be found over world, 2 from bosses and one is gotten from mayor.

Defeat Thurdoth The Fierce (first boss)

From what i can remember, this ring can be found cavern just below sand coins with high current.

Defeat Pest of Goth'Dor (Third boss)

Ting can be found right side near the entrance to lave, inside cavern with 3 sapphire fish.

This ring is located at the far right side of ocean graveyard, there is a drill spot and chest is rgiht though that.

About half way point, Mayor of Honeywood will give you this ring after completing hes quest.

Having so many charms is just so charming, you big charmer you!
Just like other three, you need to obtain every single amulet in game. There is 14 amulets to collect. ( 16 in total but legendary DLC don't count) Willow will sell 9 of these, (Requires hes shop to highest lvl), and some can be found over world and bosses.

Defeat The Eight-Armed Terror (Second boss)

On the left side of Crystal Grotto, there is a long thin cavern. Pendant can be found at the very end of it.

Above the cavern where you found obvious wizard hat, you can find this amulet.

On the same cavern where you can find High sorceress rod, you can also find this pendant.

Gifted to you by mayor after finishing quest for him.

So much gear, even Bodger is jealous!
After getting every single equipment piece there is, you get this one (Just a guess currently)

Only a true fisherman can fish ALL the best fish!
Depending on your play style, this will be last achievement.
To gain this achievement, you need to get a 5 start fish of every single one. There is total of 60 of them, and what makes this a bit harder, is that there is no clear indicator which is the fish you want. You just have to get lucky, sometimes you can get 5 start right from the start, and sometimes its just not there. Here is what i know and few hints

- What you want is the highest lvl of fish, higher the lvl , better the fish, and also harder to pull out.
- Some fishes like Needlefish and Catfish don't need bait to be captured, luckily they don't consume bait if they bite to it. Thank you xWinG 驫麤 for pointing this out.
- If fish is wrong lvl, fish it out anyway, because you are going to need the money for everything else.
- Fish don't despawn. Doesn't matter if you let it go, fail or leave area, fish lvl will stay the same until you catch it.