The Collaborative International Dictionary of English v.0.48:

Hatchment \Hatch"ment\ (-ment), n. [Corrupt. fr. achievement.]
   [1913 Webster]
   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.
      [1913 Webster]

            His obscure funeral;
            No trophy, sword, or hatchment o'er his bones.
                                                  --Shak.
      [1913 Webster]

   2. A sword or other mark of the profession of arms; in
      general, a mark of dignity.
      [1913 Webster]

            Let there be deducted, out of our main potation,
            Five marks in hatchments to adorn this thigh.
                                                  --Beau. & Fl.
      [1913 Webster]

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.
      [1913 Webster]

   2. A great or heroic deed; something accomplished by valor,
      boldness, or praiseworthy exertion; a feat.
      [1913 Webster]

            [The exploits] of the ancient saints . . . do far
            surpass the most famous achievements of pagan
            heroes.                               --Barrow.
      [1913 Webster]

            The highest achievements of the human intellect.
                                                  --Macaulay.
      [1913 Webster]

   3. (Her.) An escutcheon or ensign armorial; now generally
      applied to the funeral shield commonly called hatchment.
      --Cussans.
      [1913 Webster]

WordNet (r) 3.0 (2006):

achievement
    n 1: the action of accomplishing something [syn:
         accomplishment, achievement]

Moby Thesaurus II by Grady Ward, 1.0:

183 Moby Thesaurus words for "achievement":
   accomplished fact, accomplishment, acquirement, acquisition, act,
   acta, action, administration, advent, adventure, alerion,
   animal charge, annulet, appearance, approach, argent, aristeia,
   armorial bearings, armory, arms, arrival, attainment, azure,
   bandeau, bar, bar sinister, baton, bearings, bend, bend sinister,
   billet, blazon, blazonry, blow, bold stroke, bordure,
   bringing to fruition, broad arrow, cadency mark, canton,
   carrying out, chaplet, charge, chevron, chief, coat of arms,
   cockatrice, coming, commission, completion, conduct, consummation,
   coronet, coup, crescent, crest, cross, cross moline, crown,
   dealings, deed, device, difference, differencing, discharge,
   dispatch, doing, doings, eagle, effectuation, effort, enactment,
   endeavor, enterprise, ermine, ermines, erminites, erminois,
   escutcheon, execution, exploit, fait accompli, falcon, feat, fess,
   fess point, field, file, finish, flanch, fleur-de-lis, fret,
   fruition, fulfillment, fur, fusil, garland, gest, go, griffin,
   gules, gyron, hand, handiwork, handling, hatchment, helmet,
   heraldic device, heroic act, honor point, impalement, impaling,
   implementation, inescutcheon, job, label, lion, lozenge,
   management, maneuver, mantling, marshaling, martlet, mascle,
   measure, metal, mission accomplished, motto, move, mullet,
   nombril point, octofoil, operation, or, ordinary, orle,
   overproduction, overt act, pale, paly, passage, pean, performance,
   perpetration, pheon, proceeding, production, productiveness,
   purpure, quarter, quartering, reaching, realization, res gestae,
   rose, sable, saltire, scutcheon, shield, spread eagle, step,
   stroke, stunt, subordinary, success, tenne, thing, thing done,
   tincture, torse, tour de force, transaction, tressure, turn,
   undertaking, unicorn, vair, vert, victory, work, works, wreath,
   yale



The Devil's Dictionary (1881-1906):

ACHIEVEMENT, n.  The death of endeavor and the birth of disgust.