Here is the full list of all 105 Spyro Reignited Trilogy achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Sorceress's Lair: Defeat The Sorceress
Desert Ruins: Find both butterfly jars
Dino Mines: As Agent 9, defeat an enemy with a ricochet shot
Starfish Reef: As Sparx, defeat the Manta Ray
Spider Town: As Sparx, defeat the Spider King
Crystal Islands: Defeat all the Crystal Bears
Crawdad Farm: Defeat the Crawdad King
Agent 9's Lab: As Agent 9, shoot down all the balloons
Midnight Mountain: Free Agent 9
Scorch's Pit: Defeat Scorch
Evening Lake: Launch the Transporter Rocket
Bentley's Outpost: As Bentley, destroy all the totem poles
Evening Lake: Free Bentley the Yeti
Frozen Altars: Use ice breath to freeze 12 enemies
Charmed Ridge: Defeat a giant
Fireworks Factory: Defeat Twin Dragons (Boss)
Lost Fleet: Use cannons to shoot down all vultures
Spike's Arena: Defeat Spike
Midday Gardens: Launch the Transporter Whirligig
Sgt. Byrd's Base: As Sgt. Byrd, bomb all treasure chests
Midday Gardens: Free Sgt. James Byrd
Spooky Swamp: Defeat Sleepyhead
Bamboo Terrace: Follow the question mark bottles to the end
Icy Peak: Destroy 6 icy things using the cannons
Collect all gems in Gnasty's Loot
Unlock Gnasty's Loot
Complete Wild Flight without touching the ground
Flame all Fairies in Crystal Flight
Flame all Fairies in Night Flight
Buzz's Dungeon: Defeat Buzz
Sunrise Spring: Launch the Transporter Balloon
Seashell Shore: Defeat Bluto's nuclear shark submarine
Molten Crater: Unlock the locked treasure chest
Cloud Spires: Glide for 5+ seconds (and land safely!)
Sheila's Alp: As Sheila, destroy all headbash treasure chests
Sunrise Spring: Free Sheila the Kangaroo
Sunny Villa: Defeat all Coward Rhynocs
Use all 3 types of power-ups in Ripto's Arena
Don't hit any Sheep in Cloud Temples
Don't touch the hazardous water in Shady Oasis
Defeat every robot in Hurricos
Light 6 Gem Lamps in 15 seconds
Get Gnasty Gnorc to complete 5 laps
Complete Gnorc Cove without killing any Rats
Defeat all Draclets in one Superflight
Charge a Goat in Colossus
Complete Hunter's challenge
Defeat 4 Nightmare Beasts in one glide
Charge through 3 Armored Fools in a row
Charge through 4 Puffer Birds in a row
Jump off every Supercharge ramp in Tree Tops
Defeat 3 Demon Dogs in large form
Defeat all Tin Soldiers
Free a trapped Chicken
Collect 500 gems in Metalhead
Collect 400 gems in Blowhard
Defeat hidden Egg Thief in Wizard Peak
Defeat all three Ski Gnorcs
Defeat all Metalback Spiders
Charge through 4 Armored Druids near the start of Magic Crafters
Detonate 3 explosive chests on the pillars in Alpine Ridge
Unlock the strong chest in Doctor Shemp
Use a cannon to dispatch a taunting Gnorc
Flame every Vulture in Cliff Town
Defeat Toasty without getting hit by him
Flame 10 sheep in Stone Hill
Do a loop around an arch
Find the hidden entrance to Sunny Flight
Charge a Vulture
Take a trip with a Balloonist
Light the two bonfires in Dark Hollow
Glide to secret Egg Thief area in Town Square
Flame 5 Glowing Mushrooms in Beast Makers
Light 3 fireworks within 15 seconds
Complete Icy Flight without touching the ground
Destroy 6 gears in Twilight Harbor
Do not feed the Hungry Idol any red fish
Headbutt every turtle in Turtle Soup challenges
Destroy every Roboshark
Complete Crush's Dungeon without hitting any fodder
Heat up the audience
Complete the long glide to Orb in Autumn Plains
Don't touch the lava in Skelos Badlands
Use a cannon to defeat a TNT thrower
Clean run in the trolley
Don't get hit by Bob
Defeat every Earthshaper in Fracture Hills
Steal a Popcorn Crystal from Hunter
Complete Gulp's Overlook without harming fodder
Defeat the Snowmobiles before defeating a Hang Glider
Flame the Pigeons first in Metro Speedway
Headbash every rock in Winter Tundra
Charge through every Monkey in Mystic Marsh
Defeat the Ox without taking a hit
Defeat every Robo Bee by spitting
Defeat 5 Buggies while charging
Unlock the permanent Super Flame
Mushroom Speedway: Fly Through 4 Star Speed Boosts In One Lap
Enchanted Towers: Destroy all the balloons
Country Speedway: Fire 5 missiles in one race
Honey Speedway: Fly through 12 star speed boosts in one race
Midnight Mountain: Get revenge on Moneybags
Haunted Tomb: Destroy All Sarcophagi
Harbor Speedway: Find Hunter
Bugbot Factory: As Sparx, defeat the Metapede