Steam

Gamma Bros 1.5 achievement guide & roadmap

Properties

No missable achievements (plus 6 unknown)

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Checklists for "Get a kill with each type of weapon" type achievements
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57.4%

Triple Threat

Defeat The Triple Ship Boss

42.4%

Brain Buster

Defeat The Brainiac Boss

36.4%

Goldie

Kill The Elusive Gold Head

26.1%

Big Bro

Win on Normal

24.2%

Little Bro

Win on Easy

17.5%

Mega Bro

Win on Hard