Each Achievement has an id, a valueType, trigger params (numericalParam comparison/value, strEqParam) and one rank line per stage: value threshold, points score, gold payout, optional rewardTitle. disabled 1 switches the whole achievement off. Only the payout half is safe to edit. 
<Achievements>
  <Achievement id="6" valueType="1">
    <rank value="1000000" points="10" gold="0" />
    <rank value="20000000" points="30" gold="0" rewardTitle="7" />
  </Achievement>
  <Achievement id="30" disabled="1" valueType="1">
    <strEqParam value="s1340_thar_aliendebris13" />
    <rank value="1" points="0" gold="0" />
  </Achievement>
</Achievements>
Safe: raise points/gold, add a rewardTitle id from titles.xml, or set disabled 1 to hide a broken achievement. Never change trigger params or rank thresholds unless you know that achievement's stat; wrong thresholds make it unwinnable or instant.
Additional Notes: 

rewardTitle ids must exist in titles.xml. Trigger params are opaque.

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6 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.