Here is the full list of all 16 Attack of the Labyrinth achievements.
Collect 4K treasure in a run
Destroy 100 graves
Collect 2K treasure in a run
Collect 10 Medallions
Kill 30 dark champions
Kill 200 Arachnids
Recovered every scroll
Collect 8K treasure in a run
Collect 10K treasure in a run
Kill an ally
Kill 10 allys
You don't even have to swim in lava
Ok then... Thats it
At least there's no snakes
Obliterate 50 fairies
Find all secret champions