Here is the full list of all 33 Maldrin Journey achievements.
Complete the tutorial
Collect your first Artefact
Collect your first Special Artefact
Rescue Hyper
Rescue Swift
Rescue Burly
Restore peace
Collect 50 Artefacts
Collect 100 Artefacts
Collect all 200 Artefacts
Collect 1500 Coins
Collect 4000 Coins
Collect all 7000 Coins
Collect 4 Special Artefacts
Collect 8 Special Artefacts
Collect all 16 Special Artefacts
Complete the Gauntlet
Collect a certain Artefact on Level One
Collect a certain Artefact on Level Two
Collect a certain Artefact on Level Three
Collect a certain Artefact on Level Four
Collect a certain Artefact on Level Five
Collect a certain Artefact on Level Six
Collect a certain Artefact on Level Seven
Collect a certain Artefact on Level Eight
Collect a certain Artefact on Level Nine
Collect a certain Artefact on Level Ten
Collect a certain Artefact on Level Eleven
Collect a certain Artefact on Level Twelve
Collect a certain Artefact on Level Thirteen
Collect a certain Artefact on Level Fourteen
Collect a certain Artefact on Level Fifteen
Collect a certain Artefact on Level Sixteen