Here is the full list of all 11 Telmari Demo achievements.
You have died a total of fifty times.
Bounce on four plunger arrows.
You beat the Ancient One ten times.
You have died ten times.
Bounce on a three plunger arrows.
Meet the dodo for the first time.
Died to spines for the first time.
First death.
You have convinced the ill tempered Ancient One to accompany you.
You beat the Ancient One for the first time.
You have completed the tutorial.