Here is the full list of all 374 Sleengster 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 386 bullets
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Shoot 329 bullets
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Shoot 268 bullets
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Shoot 259 bullets
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Shoot 254 bullets
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Shoot 246 bullets
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Shoot 224 bullet
Shoot 255 bullet
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Shoot 209 bullet
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Shoot 167 bullets
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Shoot 147 bullets
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Shoot 137 bullets
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Shoot 112 bullets
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Shoot 38 bullets
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Shoot 1 bullet
Shoot 2 bullets