There are 44 achievements for this game.

There isn't a co-op/multiplayer mode, so everything's obtained from a solo playthrough.

32 achievements are obtained from the main game.
12 achievements are obtained from the DLC - Maneater: Truth Quest

https://store.steampowered.com/app/1611940/Maneater_Truth_Quest/
To read this guide in Chinese, go here:
https://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=2557067582
To read this guide in Russian, go here:
https://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=2499705850

These are obtained by completing Story Objectives.

Survivor
Survive Birth


Learned To Swim
Complete the tutorial


Survived Again
Survive Again


Vengeance is Mine
Get revenge

Experience points are gained by consuming things, & by completing objectives (Story, Hunts, Terrorizes, Nutrient Caches, etc).

Evolutions are acquired by completing Story Objectives, defeating Apex Predators, increasing the Infamy Rank, & locating every Landmark. There are 26 total Evolutions.

Growing Up
Reach Teen Growth

• Reach level 4.

On Your Own
Reached Adult Growth

• Reach level 10.

Wiser
Reached Elder Growth

• Reach level 20.

Ocean Terror
Reached Mega Growth

• Reach level 30.

Adaptation
Evolve for the first time


New Breed
Acquire 50% of available evolutions


Science Experiment
Acquire 100% of available evolutions

These achievements are obtained by completing all Story Objectives, Terrorizes, Hunts, Collectibles, Nutrient Caches, & Landmarks in each area.

Dominating the Bayou
Complete all objectives in Fawtick Bayou

Queen of the Wasteland
Complete all objectives in Dead Horse Lake

Tourist Terror
Complete all objectives in Golden Shores

Dropping Property Values
Complete all objectives in Sapphire Bay

Vacation from Hell
Complete all objectives in Prosperity Sands

Entertained to Death
Complete all objectives in Caviar Key

Ruler of the Deep
Complete all objectives in The Gulf

Deep Sea Explorer
Find all nutrient caches


Garbage Collector
Find all license plates


Tourist
Find all landmarks


Queen of the Ocean
Reach 100% objective completion in all regions

Apex Predators will spawn after completing all Story Objectives in an area.
Defeating all of them is necessary to get all Evolutions.

Gator Meat
Kill The Apex Predator in Fawtick Bayou


Delicious
Kill The Apex Predator in Dead Horse Lake


Shark on Shark Violence
Kill The Apex Predator in Golden Shores


Pound it
Kill The Apex Predator in Sapphire Bay


This is My Movie
Kill The Apex Predator in Prosperity Sands


Tricks Didn't Help Ya
Kill The Apex Predator in Caviar Key


I Thought You Were Tough
Kill The Apex Predator in The Gulf


The New Apex Predator
Destroy all Apex Predators

Infamy points are gained by destroying Hunters & their boats.

Consuming humans increases the threat level needed to summon Hunters. When an Infamy Rank is maxed, a Bounty Hunter will appear. Defeating all of them is necessary to get all Evolutions.

Rank & points won't decrease if you die, or if Hunters loose track of you. Infamy points are easier to obtain by continuing to new areas instead of trying to grind it out in starter areas.

Infamy Level 1
Reach Infamy Level 1



Infamy Level 10
Reach Infamy Level 10

These achievements are obtained from the Maneater: Truth Quest DLC.

I See Site P
Reach the Plover Island Complex


Island Queen
Complete all objectives in the Plover Island Complex


Atomic Bomb
Acquire 100% of the Atomic Evolution set


40 and Flirty
Reach level 40


Perfect Timing
Complete 100% of the Time Trials


Four-Star Rank
Defeat Adm. Barbara Terranova


Electric Burn
Kill the Electric Great White


Shadow Killer
Kill the Shadow Orca


Bone Breaker
Kill the Bone Sperm Whale


Apex Eater
Kill the Atomic Leviathan


Fan Fare
Eat all the Questers


I Can Handle the Truth!
Complete all available objective in Truth Quest

Thanks for reading!

If you have any additional information on how to complete these achievements, leave a comment so this guide can be updated!