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 50 bullets
Shoot 46 bullets
Shoot 47 bullets
Shoot 48 bullets
Shoot 49 bullets
Shoot 45 bullets
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Shoot 40 bullets
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Shoot 42 bullets
Shoot 35 bullets
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Shoot 32 bullets
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Shoot 30 bullets
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Shoot 29 bullets
Shoot 28 bullet
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Shoot 11 bullets
Shoot 12 bullets
Shoot 10 bullets
Shoot 9 bullets
Shoot 8 bullets
Shoot 7 bullets
Shoot 5 bullets
Shoot 6 bullets
Shoot 4 bullets
Shoot 3 bullets
Shoot 2 bullets
Shoot 1 bullet
Shoot 51 bullets
Shoot 52 bullets
Shoot 53 bullets
Shoot 54 bullets
Shoot 55 bullets
Shoot 56 bullets
Shoot 57 bullets
Shoot 58 bullets
Shoot 59 bullets
Shoot 60 bullets
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Shoot 70 bullets
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Shoot 100 bullets
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Shoot 103 bullets
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Shoot 105 bullets
Shoot 106 bullets
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Shoot 108 bullets
Shoot 109 bullets
Shoot 110 bullets
Shoot 111 bullets
Shoot 112 bullets
Shoot 113 bullets
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Shoot 115 bullets
Shoot 116 bullets
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Shoot 124 bullets
Shoot 125 bullets
Shoot 126 bullets
Shoot 127 bullets
Shoot 128 bullets
Shoot 129 bullets
Shoot 130 bullets
Shoot 131 bullets
Shoot 133 bullets
Shoot 134 bullets
Shoot 135 bullets
Shoot 136 bullets
Shoot 137 bullets
Shoot 138 bullets
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Shoot 140 bullets
Shoot 141 bullets
Shoot 142 bullets
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Shoot 146 bullets
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Shoot 150 bullets
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Shoot 152 bullets
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Shoot 154 bullets
Shoot 155 bullets
Shoot 156 bullets
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Shoot 158 bullets
Shoot 159 bullets
Shoot 160 bullets
Shoot 161 bullets
Shoot 162 bullets
Shoot 163 bullets
Shoot 164 bullets
Shoot 165 bullets
Shoot 166 bullets
Shoot 167 bullets
Shoot 168 bullets
Shoot 169 bullets
Shoot 170 bullets
Shoot 171 bullets
Shoot 172 bullets
Shoot 173 bullets
Shoot 174 bullets
Shoot 175 bullets
Shoot 176 bullets
Shoot 177 bullets
Shoot 178 bullets
Shoot 179 bullets
Shoot 180 bullets
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Shoot 184 bullets
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Shoot 187 bullets
Shoot 188 bullets
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Shoot 190 bullets
Shoot 191 bullets
Shoot 192 bullets
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Shoot 194 bullets
Shoot 195 bullets
Shoot 196 bullets
Shoot 197 bullets
Shoot 198 bullets
Shoot 199 bullets
Shoot 200 bullets
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Shoot 207 bullets
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Shoot 216 bullets
Shoot 217 bullets
Shoot 218 bullets
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Shoot 220 bullets
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Shoot 222 bullets
Shoot 223 bullets
Shoot 224 bullets
Shoot 225 bullets
Shoot 226 bullets
Shoot 227 bullets
Shoot 228 bullets
Shoot 229 bullets
Shoot 230 bullets
Shoot 231 bullets
Shoot 232 bullets
Shoot 233 bullets
Shoot 234 bullets
Shoot 235 bullets
Shoot 236 bullets
Shoot 237 bullets
Shoot 238 bullets
Shoot 239 bullets
Shoot 240 bullets
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Shoot 242 bullets
Shoot 243 bullets
Shoot 244 bullets
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Shoot 250 bullets
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Shoot 256 bullets
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Shoot 258 bullets
Shoot 259 bullets
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Shoot 262 bullets
Shoot 263 bullets
Shoot 264 bullets
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Shoot 266 bullets
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Shoot 288 bullets
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Shoot 292 bullets
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Shoot 300 bullets
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Shoot 308 bullets
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Shoot 310 bullets
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Shoot 313 bullets
Shoot 314 bullets
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Shoot 319 bullets
Shoot 320 bullets
Shoot 321 bullets
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Shoot 323 bullets
Shoot 324 bullets
Shoot 325 bullets
Shoot 326 bullets
Shoot 327 bullets
Shoot 328 bullets
Shoot 329 bullets
Shoot 330 bullets
Shoot 331 bullets
Shoot 332 bullets
Shoot 333 bullets
Shoot 334 bullets
Shoot 335 bullets
Shoot 336 bullets
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Shoot 338 bullets
Shoot 339 bullets
Shoot 340 bullets
Shoot 341 bullets
Shoot 342 bullets
Shoot 343 bullets
Shoot 344 bullets
Shoot 345 bullets
Shoot 346 bullets
Shoot 347 bullets
Shoot 348 bullets
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Shoot 350 bullets
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Shoot 353 bullets
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Shoot 355 bullets
Shoot 356 bullets
Shoot 357 bullets
Shoot 358 bullets
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Shoot 375 bullets
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Shoot 380 bullets
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Shoot 408 bullets
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Shoot 415 bullets
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Shoot 420 bullets
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Shoot 422 bullets
Shoot 423 bullets
Shoot 424 bullets
Shoot 425 bullets
Shoot 426 bullets
Shoot 427 bullets
Shoot 428 bullets