Here is the full list of all 13 Dream Runner Playtest achievements.
Kill you first mosnter
Reached Level 10 during run
Reached Level 20 during run
Killed 50 monsters
Kill 100 Monsters
Kill 250 Monsters
Collect 100 Memory Shards
Collect 250 Memory Shards
Collect 500 Memory Shards
Collect 1000 Memory Shards
Kill 100 Spit Fire Dragons
Reached level 25 during run
Reach Level 10 with Asteroids Intensity set to max