Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.
Above and beyond: Get a gold rating on all optional levels.
Altitude Sickness: Complete the second chapter.
Because it's there: Get a gold rating on all chapter two story levels.
Bless you!: Complete the third chapter.
Conquistador: Complete the first chapter.
Demolition: Defeat a Sentinel.
Egyptologist: Collect a treasure score of 6000 on the level Tomb of Osiris.
Eldorado: Get a gold rating on all chapter one story levels.
Extracurricular Activity: Complete one of the optional levels.
Golden Boy: Get a gold rating on 5 levels.
Great Adventurer: Complete the fourth chapter.
Hoarder: Collect a total value of 250.000 in treasures.
Howard Carter: Get a gold rating on all chapter three story levels.
I see fish people!: Meet the Agent.
Iced out: Earn a treasure score of 8000 on any level.
Innsmouth: Defeat an Agent.
King of Bling: Earn a treasure score of 10000 on any level.
Lost & Found: Get a gold rating on all chapter four story levels.
Master Puzzler: Get a gold rating on all levels.
Montgolfier: Defeat exocet.
Puzzled?: Complete first puzzle.