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 381 bullets
Shoot 382 bullets
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Shoot 327 bullets
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Shoot 345 bullets
Shoot 346 bullets
Shoot 321 bullets
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Shoot 289 bullets
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Shoot 280 bullets
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Shoot 273 bullets
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Shoot 266 bullets
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Shoot 258 bullets
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Shoot 255 bullets
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Shoot 244 bullets
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Shoot 226 bullet
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Shoot 255 bullet
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Shoot 195 bullets
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Shoot 169 bullets
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Shoot 154 bullets
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Shoot 139 bullets
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Shoot 138 bullets
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Shoot 128 bullets
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Shoot 127 bullets
Shoot 107 bullets
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Shoot 55 bullets
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Shoot 49 bullets
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Shoot 48 bullets
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Shoot 37 bullets
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Shoot 2 bullets
Shoot 1 bullet