Proje bitimini müteakip rapor eksiksiz hazırlandı.

Müteakip means “following, subsequent to”. In this sentence it corresponds to “following / after” in English.

• It is formal and bureaucratic Turkish, often seen in:
  • official letters
  • reports
  • legal/administrative language

In everyday spoken Turkish, you would usually avoid müteakip and say instead:

• sonra – after
• ardından – afterwards
• bittikten sonra – after (it) finished

So:

• Proje bitimini müteakip rapor eksiksiz hazırlandı.
  ≈ Proje bittikten sonra rapor eksiksiz hazırlandı. (more neutral/colloquial)

In Turkish grammar terms, müteakip is a postposition (like a preposition, but it comes after the noun phrase).

• English: after the end of the project
  
  • preposition after
    • noun phrase
• Turkish: proje bitimini müteakip
  
  • noun phrase proje bitimini
    • postposition müteakip

That’s why müteakip appears at the end of the phrase:

• bitimini müteakip = following its completion / after its completion

bitimini can be broken down as:

• bitim – end, completion (a noun from bitmek = to end, to finish)
• -i – 3rd person singular possessive: its
• -ni – accusative case marker

So:

• bitim-i = its completion / the completion of it
• bitim-i-ni = its completion (ACC)

In the phrase proje bitimini, the whole thing means:

• proje bitimi – the completion of the project
• proje bitimini – the completion of the project (ACC), governed by the postposition müteakip.

Both structures exist, but they are slightly different:

1. proje bitimi

   • a noun–noun compound: project completion
   • first noun (proje) is bare
   • second noun (bitim) gets the 3rd person possessive: bitim-i
   • feels a bit more compact, technical, or bureaucratic

2. projenin bitimi

   • a genitive–possessive construction: the project’s completion
   • projenin (genitive: of the project)
   • bitimi (its completion)

Here, proje bitimini müteakip sounds like formal written style.
You could also say:

• Projenin bitimini müteakip – also acceptable, just slightly less compact.
• In neutral language: Proje bittikten sonra.

The accusative -i / -ı / -u / -ü here is not marking a direct object of a verb, but is required by the postposition müteakip. Some Turkish postpositions require the preceding noun phrase to be:

• in accusative (like müteakip)
• or in genitive
• or in ablative, etc.

So müteakip governs the accusative:

• bitim-i-ni müteakip – following its completion

If you instead used sonra, you would usually need -den (ablative):

• projenin bitiminden sonra – after the completion of the project
• proje bittikten sonra – after the project is finished

Yes. Rapor is the subject of the sentence:

• rapor – the report (nominative)
• eksiksiz – completely / without omissions (here describing how it was prepared)
• hazırlandı – was prepared (passive verb)

So the core structure is:

• Rapor hazırlandı. – The report was prepared.
• With extra detail: Rapor eksiksiz hazırlandı. – The report was prepared completely / with no missing parts.

Yes, hazırlandı is the passive form of hazırlamak (to prepare something).

Formation:

• hazırlamak – to prepare
• hazırlanmak – to be prepared (passive/reflexive stem)
• hazırlandı – was prepared (-dı simple past)

In passive sentences, the doer/agent is often:

• unknown
• unimportant
• or obvious from context

So in English we’d say:

• The report was prepared (after the completion of the project).

You could add an agent if really needed:

• Proje ekibi tarafından rapor eksiksiz hazırlandı.
  – The report was prepared completely by the project team.

Eksiksiz is an adjective meaning:

• “complete, with nothing missing, without omissions”

In this sentence, it’s used adverbially to describe the manner of preparation:

• rapor eksiksiz hazırlandı
  = the report was prepared in a complete way / with no missing parts

Using eksik değil would change the nuance and structure:

• Rapor eksik değil. – The report is not incomplete. (a simple state, no action)
• Rapor eksik olmadan hazırlandı. – grammatical, but heavier than eksiksiz hazırlandı.

Eksiksiz is the natural, concise choice here.

Some variation is possible, but not all orders are equally natural.

Original:

• Proje bitimini müteakip rapor eksiksiz hazırlandı.
  (Following the completion of the project, the report was prepared completely.)

Other acceptable orders:

• Proje bitimini müteakip rapor eksiksiz olarak hazırlandı. (adds olarak, still fine)
• Rapor proje bitimini müteakip eksiksiz hazırlandı. (a bit heavier, but grammatical)

Less natural or different in nuance:

• Eksiksiz rapor hazırlandı.
  This can sound like “A complete report was prepared” (focus on what kind of report, not how it was prepared).

So in your sentence, “rapor eksiksiz hazırlandı” is the most natural way to say “the report was prepared completely”.

• müteakip – postposition or adjective meaning following, subsequent (to)

  • proje bitimini müteakip – following the completion of the project

• müteakiben – adverb meaning subsequently, afterwards

  • Projenin bitiminden sonra, müteakiben rapor hazırlandı.
    – After the project’s completion, the report was subsequently prepared.

You could rephrase your sentence with müteakiben, but the structure changes:

• Projenin bitiminden sonra rapor eksiksiz hazırlandı.
• (Bunun) müteakiben rapor eksiksiz hazırlandı. – Subsequently, the report was prepared completely.

Your original wording specifically uses müteakip as a postposition taking bitimini in the accusative.

A neutral, more spoken-style version could be:

• Proje bittikten sonra rapor eksiksiz hazırlandı.
  – After the project was finished, the report was prepared completely.

Or:

• Projenin bitmesinden sonra rapor eksiksiz hazırlandı.
• Proje bittikten sonra rapor tam ve eksiksiz hazırlandı. (adding tam for emphasis)

Proje bitimini müteakip rapor eksiksiz hazırlandı.

• proje – project
• bitim-i-ni – its-completion-ACC
• müteakip – following (postposition “after”)
• rapor – report
• eksiksiz – completely, with nothing missing
• hazırlandı – was-prepared (passive, simple past)

Very literal:

• Following the project’s completion, the report was prepared completely.