Here is the full list of all 43 Metal Swarm Infinity achievements.
Survive a boss battle and fly to a new zone.
Complete Wave 30 for the first time.
Complete Wave 50 for the first time.
Reach Wave 60 in Infinity Mode.
Reach Wave 75 in Infinity Mode.
Defeat a boss in Practice Mode for the first time.
Complete Wave 25 in Practice Mode.
Complete Wave 5 in Deathwish Mode.
Complete Wave 25 in Deathwish Mode.
Complete Wave 50 in Deathwish Mode.
Kill 100 Bugs across all games.
Kill 1000 Bugs across all games.
Kill 2,500 Bugs across all games.
Kill 5,000 Bugs across all games.
Kill 10,000 Bugs across all games.
Defeat Pr3daT0r in a boss battle.
Defeat MegaBug in a boss battle.
Defeat The King in a boss battle.
Defeat The Queen in a boss battle.
Defeat S.W.A.R.M in a boss battle.
Defeat all 5 bosses atleast once.
Defeat all 5 bosses in a single run.
Unlock the Weapons Systems upgrade for the first time.
Unlock the Defense Matrix upgrade for the first time.
Unlock the Ammo Capacity upgrade for the first time.
Unlock the Propulsion Engine upgrade for the first time.
Unlock the Lucky Charm upgrade for the first time.
Unlock all 5 Ship Upgrades in a single run.
Complete Wave 25 without buying any Power Core Upgrades.
Purchase an Extra Life using a Power Core for the first time.
Purchase 3 Extra Lives using Power Cores in a single run.
Purchase 5 Extra Lives using Power Cores in a single run.
Collect a Triple Shot Powerup for the first time.
Collect a Mega Shot Powerup for the first time.
Collect a Seeker Shot Powerup for the first time.
Collect a Rainbow Stream Powerup for the first time.
Collect a Plasma Beam Powerup for the first time.
Collect a Resupply Powerup for the first time.
Collect a (Rare) Extra Life Powerup for the first time.
Collect a (Rare) Invulnerability Powerup for the first time.