Here is the full list of all 18 Rocket Wars achievements.
Win a game of Nuke King by surpassing the leading player via the last Nuke explosion
Kill 50 enemies
Detonate the Nuke without taking damage
Unlock your first ship
Stay in orbit around the sun for a full 10 seconds without thrusting
Get a triple-kill with the Buzzsaw
Win a game of Survivor without dying once
Play 3 matches of any mode with a full lobby of people
Unlock all 12 ships
Kill 3 enemies with a single Sniper weapon (across all 3 shots)
Destroy 30 mines
Kill a player who has the Nuke within 1 second of him getting it
Kill 150 enemies
Kill 500 enemies
Kill 20 enemies by using the Pulse as a melee weapon
Kill an enemy by deflecting his own Sniper shot with the Pulse
Kill 2 enemies with a single Shotgun burst
Kill an enemy by deflecting a Buzzsaw