Here is the full list of all 35 Neonis achievements.
Play the classic gamemode once
Get over 1000 points in the classic gamemode
Get over 5000 points in the classic gamemode
Get over 10000 points in the classic gamemode
Get over 20000 points in the classic gamemode
Get over 30000 points in the classic gamemode
Get over 50000 points in the classic gamemode
Play the chaos gamemode once
Get over 1000 points in the chaos gamemode
Get over 5000 points in the chaos gamemode
Get over 10000 points in the chaos gamemode
Get over 20000 points in the chaos gamemode
Get over 30000 points in the chaos gamemode
Get over 50000 points in the chaos gamemode
Play the dodge gamemode once
Get over 500 points in the dodge gamemode
Get over 1000 points in the dodge gamemode
Get over 2000 points in the dodge gamemode
Get over 3000 points in the dodge gamemode
Get over 4000 points in the dodge gamemode
Get over 5000 points in the dodge gamemode
Play the flood gamemode once
Get over 1000 points in the flood gamemode
Get over 2500 points in the flood gamemode
Get over 5000 points in the flood gamemode
Get over 10000 points in the flood gamemode
Get over 20000 points in the flood gamemode
Get over 30000 points in the flood gamemode
Play every gamemode once
Get rookie status in every gamemode
Get beginner status in every gamemode
Get skilled status in every gamemode
Get intermediate status in every gamemode
Get advanced status in every gamemode
Get expert status in every gamemode