Here is the full list of all 30 Rocket Fist achievements.
In a Survival match, have the highest number of kills and still lose the match.
Complete 5 multiplayer matches without destroying any robot (pacifist title)
Hit 3 Longshots in the same multiplayer match
Destroy 15 enemies while using the Shrink power up on multiplayer.
Win a deathmatch against three opponents without dying once (invincible title)
Block 10 incoming fists with the shield powerup on multiplayer
Smash at least 2 robots with one dash while using the Big power up on multiplayer
Kill 3 players on multiplayer with one single punch.
Set the music volume to 0.
Parry an enemy fist with your own fist 20 times.
50 bounceshots.
Destroy 10 cannons with its own bomb.
Destroy 25 enemies with bombs.
Beat a non-tutorial sector without dying. (Normal difficulty or higher)
Have 30 Double Kills
Have 50 Stunsteals
Stun the same enemy 10 times.
Destroy a bomb robot and die within the explosion.
Catch 20 incoming fists.
Complete the Tutorial
Complete Sector 1
Complete Sector 2
Complete Sector 3
Complete Sector 4
Complete Sector 5
Have 10 Close calls, with only one life left.
Play 50 Deathmatches
Play 50 Survival matches
Have 25 Indirect Kills
Get an after death kill.