Alright.
Iss ka matlab yeh hai kay app apna 'character/personality' sahe kerrain. Good character meyn achi chaal chalan, acha kirdaar, achi siirat, etc. Basically 'Akhlaaq' means (good) manners/character. If anyone tells you to rectify it then you should take into consideration your habits(aadat), character and manners.
Aur Ikhlaas means sincerity.
-Aik toh Quran ki Surat hai Surah Ikhlaas.
-Dusra Ikhlaas ka matlab yeh hai kay saadgi, khuluus, mukhlisi, sidq-e-dil, sachcha ya phir wafa daar. In English I would define it as honesty, genuineness, realness, and earnestness(seriousness).
Koi b naik kaam ikhlaas kay saath kerna chaheyeh. [Matlab yeh kay riyakari(ostentation) na kerrain]
Dikhaawa na kerrain. sirf aur sirf Allah azzawajal ki razaa kay liyeh kerrain.
I hope that helps.
And Allah Azzawajal knows the best.