No, I read it. If it was possible to keep all of G-d's laws, then sacrifice and repentance would never be necessary.
I also read the following verses:
15 See, I set before you today life and prosperity, death and destruction. 16 For I command you today to love the LORD your God, to walk in his ways, and to keep his commands, decrees and laws; then you will live and increase, and the LORD your God will bless you in the land you are entering to possess.
17 But if your heart turns away and you are not obedient, and if you are drawn away to bow down to other gods and worship them, 18 I declare to you this day that you will certainly be destroyed. You will not live long in the land you are crossing the Jordan to enter and possess.
19 This day I call heaven and earth as witnesses against you that I have set before you life and death, blessings and curses. Now choose life, so that you and your children may live 20 and that you may love the LORD your God, listen to his voice, and hold fast to him. For the LORD is your life, and he will give you many years in the land he swore to give to your fathers, Abraham, Isaac and Jacob.
In verse 16 G-d tells us FIRST to love Him, second to walk in His ways, and then to follow His commands and laws. The following passages tell of the consequences. A very similar passage is found in the book of Joshua and probably other books of the Bible.
I ask again, have you or anyone you know of beeen able to keep ALL of G-d's laws?
actually no. many laws are negative commands which by the very nature of not doing these things one does not sin. quite a few others, Temple related services and worship apply only when the Temple service is active (it should be restored speedily). others are only applicable in the land of Israel itself. the foundation of your question seems to be asking, if you cant keep all why keep any? i could be wrong about that. however, if that is the point, using the text that you quote one could only conclude that the more laws one keeps the more one approaches what G-d wants whereas ignoring them entirely places one in the category of death and evil. it is interesting that i had quoted the same Deut. that you did a few posts earlier. one of the "ethical" texts in the Mishna which doesnt teach laws per se but how one should live says this:
He [Rabbi Tarfon] used to say, it is not upon you to complete the task, but you are not free to idle from it. If you have learned much Torah, you will be given much reward. And faithful is your Employer that He will reward you for your labor. And know that the reward of the righteous will be in the World to Come." http://www.torah.org/learning/pirkei-avos/chapter2-21.html
do as much as you can as well as you can. your loyalty and intent matters. those who are going up in observance are rewarded. those who do little when they are capable of more will have to account for their behavior.
It wouldn't surprise me one bit if Rabbi Menachem Schneerson, the last Lubavitch rebbe managed to. I have no way to know for certain, however.