Mars Lander - Level 1 - "Economic" Achievement can't be unlocked

I’ve solved the puzzle and then realised, that i haven’t unlocked the third achievement (“Economic”). So i solved it again so that i unlock the third achievement too but i couldn’t unlock this achievement even so i’ve finished the task with 306l fuel left.
Is it only possible to unlock those achievements with my very first code that i send with the “submit”-button?

There is a difference between the IDE testcases and the validation testcases. Does your algorithm solve the validation testcase?

where/witch one is the validation testcase? O.ö

The tests that run after you submit your code.

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