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 423 bullets
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Shoot 418 bullets
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Shoot 388 bullets
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Shoot 382 bullets
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Shoot 377 bullets
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Shoot 367 bullets
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Shoot 364 bullets
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Shoot 350 bullets
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Shoot 339 bullets
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Shoot 334 bullets
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Shoot 315 bullets
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Shoot 305 bullets
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Shoot 300 bullets
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Shoot 297 bullets
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Shoot 291 bullets
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Shoot 288 bullets
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Shoot 286 bullets
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Shoot 279 bullets
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Shoot 275 bullets
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Shoot 278 bullets
Shoot 273 bullets
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Shoot 268 bullets
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Shoot 262 bullets
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Shoot 259 bullets
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Shoot 255 bullets
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Shoot 229 bullets
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Shoot 225 bullets
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Shoot 205 bullets
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Shoot 204 bullets
Shoot 196 bullets
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Shoot 194 bullets
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Shoot 187 bullets
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Shoot 179 bullets
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Shoot 168 bullets
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Shoot 117 bullets
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Shoot 113 bullets
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Shoot 116 bullets
Shoot 108 bullets
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Shoot 106 bullets
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Shoot 85 bullets
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Shoot 47 bullets
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Shoot 6 bullets
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Shoot 2 bullets
Shoot 1 bullet