The Collaborative International Dictionary of English v.0.48:

Hatchment \Hatch"ment\ (-ment), n. [Corrupt. fr. achievement.]
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   1. (Her.) A sort of panel, upon which the arms of a deceased
      person are temporarily displayed, -- usually on the walls
      of his dwelling. It is lozenge-shaped or square, but is
      hung cornerwise. It is used in England as a means of
      giving public notification of the death of the deceased,
      his or her rank, whether married, widower, widow, etc.
      Called also achievement.
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            His obscure funeral;
            No trophy, sword, or hatchment o'er his bones.
                                                  --Shak.
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   2. A sword or other mark of the profession of arms; in
      general, a mark of dignity.
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            Let there be deducted, out of our main potation,
            Five marks in hatchments to adorn this thigh.
                                                  --Beau. & Fl.
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The Collaborative International Dictionary of English v.0.48:

Achievement \A*chieve"ment\ (-ment), n. [Cf. F. ach[`e]vement,
   E. Hatchment.]
   1. The act of achieving or performing; an obtaining by
      exertion; successful performance; accomplishment; as, the
      achievement of his object.
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   2. A great or heroic deed; something accomplished by valor,
      boldness, or praiseworthy exertion; a feat.
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            [The exploits] of the ancient saints . . . do far
            surpass the most famous achievements of pagan
            heroes.                               --Barrow.
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            The highest achievements of the human intellect.
                                                  --Macaulay.
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   3. (Her.) An escutcheon or ensign armorial; now generally
      applied to the funeral shield commonly called hatchment.
      --Cussans.
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