Here is the full list of all 25 The secret pyramid Demo achievements.
Reach the tomb 1st floor for the first time
Reach the tomb 2nd floor for the first time
Reach the tomb 3rd floor for the first time
Reach the tomb 4th floor for the first time
Reach the tomb 5th floor for the first time
Reach a secret room for the first time
Reach a scarab nest for the first time
Eliminate a total of 10 monsters
Eliminate a total of 100 monsters
Eliminate a total of 1000 monsters
Get 100 eliminations with a pistol
Get 100 eliminations with an SMG
Get 100 eliminations with a shotgun
You beat “The Big White Mummy”!
You beat “Phantom of Pharaoh”!
You beat “The Colossus of Anubis”!
The 1st death
The 9th death
Collect 1000 gold coins
Collect 10000 gold coins
Collect 100000 gold coins
Collect 100 fragments
Collect 1000 fragments
Collect 10000 fragments
Buy a new weapon