Here is the full list of all 428 Sleengster achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 427 bullets
Shoot 428 bullets
Shoot 424 bullets
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Shoot 394 bullets
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Shoot 389 bullets
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Shoot 379 bullets
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Shoot 368 bullets
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Shoot 363 bullets
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Shoot 346 bullets
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Shoot 335 bullets
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Shoot 312 bullets
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Shoot 306 bullets
Shoot 294 bullets
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Shoot 291 bullets
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Shoot 293 bullets
Shoot 286 bullets
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Shoot 281 bullets
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Shoot 285 bullets
Shoot 275 bullets
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Shoot 280 bullets
Shoot 272 bullets
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Shoot 274 bullets
Shoot 266 bullets
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Shoot 263 bullets
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Shoot 253 bullets
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Shoot 225 bullets
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Shoot 194 bullets
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Shoot 179 bullets
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Shoot 174 bullets
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Shoot 169 bullets
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Shoot 164 bullets
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Shoot 133 bullets
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Shoot 115 bullets
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Shoot 110 bullets
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Shoot 114 bullets
Shoot 104 bullets
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Shoot 98 bullets
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Shoot 93 bullets
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Shoot 84 bullets
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Shoot 79 bullets
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Shoot 48 bullets
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Shoot 6 bullets
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Shoot 2 bullets
Shoot 1 bullet