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 388 bullets
Shoot 389 bullets
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Shoot 374 bullets
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Shoot 350 bullets
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Shoot 349 bullets
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Shoot 330 bullets
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Shoot 345 bullets
Shoot 346 bullets
Shoot 326 bullets
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Shoot 273 bullets
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Shoot 268 bullets
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Shoot 264 bullets
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Shoot 259 bullets
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Shoot 255 bullets
Shoot 246 bullets
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Shoot 223 bullet
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Shoot 255 bullet
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Shoot 198 bullets
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Shoot 175 bullets
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Shoot 145 bullets
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Shoot 138 bullets
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Shoot 136 bullets
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Shoot 112 bullets
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Shoot 117 bullets
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Shoot 106 bullets
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Shoot 94 bullets
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Shoot 58 bullets
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Shoot 57 bullets
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Shoot 44 bullets
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Shoot 37 bullets
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Shoot 1 bullet
Shoot 2 bullets