Here is the full list of all 27 Mactabilis achievements.
Complete a regular game with the lowest rank.
Complete a regular game with rank A.
Complete a regular game in hardcore mode.
Complete an arcade game with the lowest rank.
Complete an arcade game with rank A.
Complete an arcade game in hardcore mode.
Obtain a 50X combo.
Obtain a 100X combo.
Obtain a 200X combo.
Buy a weapon you designed yourself.
Collect 20000$ without spending it.
Collect 40000$ without spending it.
Collect 80000$ without spending it.
Kill 2000 enemies.
Kill 10000 enemies.
Kill 25000 enemies.
Obtain 5 upgrades of the same type in the same game.
Obtain 15 upgrades of the same type in the same game.
Obtain 30 upgrades of the same type in the same game.
Complete a full regular game without buying a weapon.
Access the secret level.
Obtain a 5X combo in PVP.
Reach the second completion.
Reach the third completion.
Buy a single weapon worth at least 10000$.
Buy a single weapon worth at least 30000$.
Buy a single weapon worth at least 40000$.