Spyro™ Reignited Trilogy

World: Charmed Ridge

The Harder They Fall
Charmed Ridge: Defeat a giant

While doing Charmed Ridge there are Wizards which will increase the size of Rhynocs you come by. Just flame any of the chargers after they have been turned to a giant to get this achievement.
Picture below.

World: Bentley's Outpost

It's Totem Destruction
Bentley's Outpost: As Bentley, destroy all the totem poles

There are several totem poles placed around Bentley's Outpost which you can destroy. Whack them until you can destroy the chests at top the of them. All of them are pretty easy to spot but if you still miss some after you are at the end of the level use Sparx to detect gems to locate the last poles. Picture as reference so you know what to look for.

World: Honey Speedway

Real Star Power
Honey Speedway: Fly through 12 star speed boosts in one race

There are a total of 7 speed boosts per lap so you will need to do almost 2 whole laps for the achievement. Picture reference below.

World: Scorch's Pit

Scorched!
Scorch's Pit: Defeat Scorch

Unmissable

You need to defeat Scorch to advance into the next level. He is not too special. Bentley will drop you missiles from time to time. Use them while the boss's shield is down.

The boss itself has two abilities, one of which is shooting barrages of fire into the ground which are easy to avoid. The other one is dropping a few eggs from time to time which will spawn some crab enemies for you to take out. After the boss is down the achievement will pop.

World: Starfish Reef

Manta Erayser
Starfish Reef: As Sparx, defeat the Manta Ray

After you defeat Scorch you will unlock this Sparx level.

World: Midnight Mountain
That Monkey's Gonna (Make Them) Pay...
Midnight Mountain: Free Agent 9

Freeing Agent 9 costs you 1300 Gems and is the last person you need to free. You have to free him as you need him for his homeworld achievement Someone Set Us Up the Bomb and for the Nice Shootin' Tex achievement in Dino Mines.

World: Midnight Moutain
8000 Reasons to Kick Butt
Midnight Mountain: Get revenge on Moneybags

If you have been following the guide so far this will be last achievement you will earn in the game. You can do this achievement after beating the sorceress.

He will be on one of the bridges in Midnight Mountains bragging about the egg he has found. This leads to Spyro finally being able to give some hard earned trashing to Moneybags.

During this chase sequence Spyro will be able to either flame or charge him to take back all of the gems you have given to him during Spyro 3. Once he runs out of gems he will give you the egg as well which he was planning to sell in Avalar from Spyro 2.
After you have kicked Moneybags butt in this event all the paywalls you have not paid for yet will be automatically opened.

World: Crystal Islands

Vanishing Act
Crystal Islands: Defeat all the Crystal Bears

Crystal Bears are the enemies you will encounter while doing the Crystal Islands. You should get all of the Crystal Bears while progressing through the level normally. Picture below.

World: Desert Ruins

Butterfly Hunter
Desert Ruins: Find both butterfly jars

During Desert Ruins there will be two butterfly jars which are placed around the level. We will go and see where they are located.

The first one is fairly close to the start when you are about to enter the temple. Instead of entering, turn to the left of the temple and charge / flame through the bronze scorpion to see ladders to your right. Climb them. From the ladders turn right and you should see a Rock Hand in front of you. Take it out and behind it is the first jar (Picture 1).

To get the second jar, instead of turning left from the temple, enter it. As you progress through the temple you should see the jar right away on the ledge in front of you. Progress inside the temple till you see ladders next to you. From there climb them and take out the Rock Hand and one of the Scorpions. After you have defeated both of those, turn around and keep going on until you see a platform to your left with a jar on it. From the platform you are standing on right now, glide to the platform with the butterfly jar for the achievement (Picture 2).

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World: Haunted Tomb

A Sarcopha-Kinda Guy
Haunted Tomb: Destroy All Sarcophagi

As you progress through this level you should come by some Sarcophagi which seem to be indestructible. In the same area you should see big mummies throwing some lava rocks at you. You can use these to destroy the Sarcophagi so you should not take all of the big mummies out before you have taken every Sarcophagi. Picture below for reference so you know what both of them look like.

World: Dino Mines

Nice Shootin' Tex
Dino Mines: As Agent 9, defeat an enemy with a ricochet shot

There is a shooter activity sub-level in the Dino Mines just for Agent 9. As you progress through this area with Agent 9 you need to defeat one of the enemies with a ricochet shot. Just keep shooting the walls behind the enemies until this achievement pops. There are more than enough opportunities to get this achievement during this challenge so don't worry if you don't get it on your first go. Just retry the area if that happens.

World: Agent 9's Lab

Someone Set Us Up the Bomb
Agent 9's Lab: As Agent 9, shoot down all the balloons

During Agent 9's Lab there are several vases up in the air which you need to shoot as Agent 9.
One of them is floating under the ceiling in the first room you enter. This is where you have to shoot the rhynos behind cover from the elevated pedestal in the center of the room.
Rest of the vases are in the outside areas so you need to look out for them during that time.

World: Harbor Speedway

Hunt for Hunter
Harbor Speedway: Find Hunter

Easiest Speedway out there. Hunter thinks he is well hidden inside of his lighthouse but he probably needs to rethink his strategy. After talking to Hunter inside the lighthouse you will earn this achievement. You don't actually need to finish his challenge unless you want to get one of the eggs out of it.

World: Sorceress's Lair

Sorceress Down!
Sorceress's Lair: Defeat The Sorceress

Unmissable

As mentioned at the start of the guide you only need 100 Eggs to 100% the game and it is only because you need them to unlock The Sorceress boss fight. The boss fight is your typical three phase affair so check the video if you need help.
1:45:05 - Sorceress Down! | Achievement / Trophy

World: Bugbot Factory

Debugging Bugbot Factory: As Sparx, defeat the Metapede
You will unlock the last Sparx level after you have defeated The Sorceress. The achievement will unlock after you have finished this level.