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 425 bullets
Shoot 426 bullets
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Shoot 415 bullets
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Shoot 396 bullets
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Shoot 387 bullets
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Shoot 378 bullets
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Shoot 373 bullets
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Shoot 363 bullets
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Shoot 359 bullets
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Shoot 355 bullets
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Shoot 341 bullets
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Shoot 337 bullets
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Shoot 314 bullets
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Shoot 308 bullets
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Shoot 298 bullets
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Shoot 303 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 276 bullets
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Shoot 278 bullets
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Shoot 280 bullets
Shoot 272 bullets
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Shoot 275 bullets
Shoot 267 bullets
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Shoot 263 bullets
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Shoot 258 bullets
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Shoot 254 bullets
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Shoot 249 bullets
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Shoot 229 bullets
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Shoot 225 bullets
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Shoot 212 bullets
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Shoot 207 bullets
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Shoot 204 bullets
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Shoot 194 bullets
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Shoot 185 bullets
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Shoot 175 bullets
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Shoot 166 bullets
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Shoot 126 bullets
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Shoot 121 bullets
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Shoot 125 bullets
Shoot 117 bullets
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Shoot 120 bullets
Shoot 112 bullets
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Shoot 109 bullets
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Shoot 111 bullets
Shoot 103 bullets
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Shoot 98 bullets
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Shoot 93 bullets
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Shoot 89 bullets
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Shoot 85 bullets
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Shoot 49 bullets
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Shoot 42 bullets
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Shoot 37 bullets
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Shoot 9 bullets
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Shoot 5 bullets
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Shoot 2 bullets
Shoot 1 bullet