Here is the full list of all 29 Astral Guardian achievements.
Kill 100 monsters
Kill 500 monsters
Kill 1000 monsters
Kill 3000 monsters
Kill 6000 monsters
Kill 10000 monsters
Kill 15000 monsters
Kill 25000 monsters
Kill 50000 monsters
Kill 100000 monsters
Win the game 1 times
Win the game 10 times
Win the game 50 times
Win the game 100 times
Win the game 500 times
Win the game 1000 times
Win the game 3000 times
Win the game 6000 times
Win the game 10000 times
Win the game 20000 times
Play the game 10 times
Play the game 50 times
Play the game 100 times
Play the game 500 times
Play the game 1000 times
Play the game 5000 times
Play the game 10000 times
Play the game 20000 times
Play the game 50000 times