Here is the full list of all 37 Code51:Mecha Arena achievements.
Start a match.
Complete the tutorial level.
Complete a practice or multiplayer game.
In a multiplayer game, kill an enemy in DANGER state.
Use Charge ability to kill 15 enemies in multiplayer games.
Complete 100 multiplayer games.
Complete 300 multiplayer games.
Win 50 multiplayer games.
Get 500 scores in a multiplayer game.
Win 6 multiplayer games in a row.
Kill 20 enemies in a multiplayer game.
Lose 10 multiplayer games in a row.
Win a multiplayer game without picking up any item.
Suffered from 3 DANGER states, yet still survived in a multiplayer game.
Win a multiplayer game, in which you miss less than 25% shoots.
Take the most damages in 3 multiplayer games in a row.
Lost most scores in 3 multiplayer games in a row.
Reach level 5.
Reach level 25.
Reach level 50.
Drive 9 different mechs in mutlplayer games.
Take 3,000,000 damage points in multiplayer games.
Collect 150 weapon upgrades in multiplayer games.
Collect 75 repair kits in multiplayer games.
Survive a multiplayer game.
In a multiplayer game, kill 10 enemies in a row.
Destroy 100 enemies in multiplayer games.
Destroy 1000 enemies in multiplayer games.
When using Fortress in a multiplayer game, start the Power Shield in DANGER state.
When using Hell Fire in a multiplayer game, destroy 2 enemies using Ammo Flood.
When using Eskimo in a multiplayer game, destroy an enemy with your homing missile, who is not revealed by the radar.
When using Hunter in a multiplayer game, destroy an enemy with your minion.
When using Raven in a multiplayer game, destroy 3 enemies with your TOW Missile.
When using Ranger in a multiplayer game, achieve 30 critical hits.
When using Flash Flare in a multiplayer game, collect 9 supplies without being destroyed.
When using Loong in a multiplayer game, destroy 2 enemies in a row without touching any ground.
When using Ninja in a multiplayer game, destroy 2 enemies with your EMP Blast.