Here is the full list of all 62 Trine 5: A Clockwork Conspiracy achievements.
Cross all the rivers in the Long Way to Town without touching the water
Complete a level without taking any damage
Complete a level without breaking any of the Wooden Boxes
Collect all Letters throughout Acts I-V
Collect all experience in The Magnificent Airship
Collect all experience throughout Acts I-V
Collect all experience in Petrified Marshes
Collect all experience in The Bastion of Hope
Collect all Tidbits throughout Acts I-V
Collect all experience in The Floating Archipelago
Collect all Bags and Hats throughout Acts I-V
Collect all experience in The Clockwork Palace
Complete The Dethroning
Thwart Sunny's and Goderic's plans
Complete The Clockwork Palace
Complete The Floating Archipelago
Use Amadeus's Spinning Ball to destroy a chilled enemy
Destroy an enemy using an unarmed Pontius Clone
Complete The Magnificent Airship
Complete The Bastion of Hope
Meet all the three Astral Observatory Wizards
Collect all experience in Autumn Woods
Collect all experience in Brackenridge Path
Collect all experience in Smuggler's Way
Complete Petrified Marshes
Destroy an enemy using a projectile from a Wall Spitter Plant
Collect all experience in Gemstone Caverns
Complete Autumn Woods
Find the Dancing Mushrooms in the Autumn Woods
Collect all experience in The Astral Observatory
Complete The Astral Observatory
Complete Brackenridge Path
Collect all experience in The Tallest Tower
Complete Gemstone Caverns
How far can you go with Pontius's Shield Sliding?
Charge the Church Bell in the Garden of Eternal Shade
Collect all experience in Dungeons and Sewer Rats
Collect all experience in The Royal Castle
Don't let Kraken's tentacles hit you in the Smuggler's Way
Complete Smuggler's Way
Complete Dungeons and Sewer Rats
Conjure a box to comply with the Shopkeeper's request in The Tallest Tower
Complete The Tallest Tower
Collect all experience in Sinister Back Alleys
Complete The Royal Castle
Destroy two enemies with a single arrow
Collect all experience in The Long Way to Town
Complete Sinister Back Alleys
During a single fight, make a Clockwork Guardian use the Spin Attack five times
Complete The Long Way to Town
Deliver the Pie from the Red Rose Inn to the end of the level
Collect all experience in The Astral Academy Gardens
Defeat the Clockwork Knights posing as the Heroes of Trine in the Red Rose Inn
When a defeated Clockwork Mosquito is exploding, use the blast to destroy another Clockwork Mosquito
Complete The Astral Academy Gardens
Use Amadeus to destroy a Clockwork Mosquito with a conjured item
Collect all experience in The Well of Tranquility
Complete The Well of Tranquility
Collect all experience in The Garden of Eternal Shade
Complete The Garden of Eternal Shade
Collect all experience in The Town Library
Complete The Town Library